53
53
Sep 23, 2013
09/13
by
Krzysztof Findeisen; Lynne Hillenbrand; Eran Ofek; David Levitan; Branimir Sesar; Russ Laher; Jason Surace
texts
eye 53
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We present first results from a new, multiyear, time domain survey of young stars in the North America Nebula complex using the Palomar Transient Factory. Our survey is providing an unprecedented view of aperiodic variability in young stars on timescales of days to years. The analyzed sample covers R_PTF = 13.5-18 and spans a range of mid-infrared color, with larger-amplitude optical variables (exceeding 0.4 mag root-mean-squared) more likely to have mid-infrared evidence for circumstellar...
Source: http://arxiv.org/abs/1303.3629v1
86
86
Sep 23, 2013
09/13
by
Frank J. Masci; Russ Laher; Fan Fang; John Fowler; Wen Lee; Susan Stolovy; Deborah Padgett; Mehrdad Moshir
texts
eye 86
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The 24 micron array on board the Spitzer Space Telescope is one of three arrays in the Multi-band Imaging Photometer for Spitzer (MIPS) instrument. It provides 5.3 x 5.3 arcmin images at a scale of ~2.5 arcsec per pixel corresponding to sampling of the point spread function which is slightly better than critical (~0.4\lambda/D). A scan-mirror allows dithering of images on the array without the overhead of moving and stabilizing the spacecraft. It also enables efficient mapping of large areas of...
Source: http://arxiv.org/abs/astro-ph/0411316v1
3
3.0
Jun 30, 2018
06/18
by
David Levitan; Paul J. Groot; Thomas A. Prince; Shrinivas R. Kulkarni; Russ Laher; Eran O. Ofek; Branimir Sesar; Jason Surace
texts
eye 3
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The AM CVn systems are a class of He-rich, post-period minimum, semi-detached, ultra-compact binaries. Their long-term light curves have been poorly understood due to the few systems known and the long (hundreds of days) recurrence times between outbursts. We present combined photometric light curves from the LINEAR, CRTS, and PTF synoptic surveys to study the photometric variability of these systems over an almost 10 yr period. These light curves provide a much clearer picture of the outburst...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1410.6987
4
4.0
Jun 29, 2018
06/18
by
Chan-Kao Chang; Hsing-Wen Lin; Wing-Huen Ip; Thomas A. Prince; Shrinivas R. Kulkarni; David Levitan; Russ Laher; Jason Surace
texts
eye 4
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In order to look for large super-fast rotators, five dedicated surveys covering ~ 188 square degree in the ecliptic plane have been carried out in R-band with ~10 min cadence using the intermediate Palomar Transient Factory in late 2014 and early 2015. Among 1029 reliable rotation periods obtained from the surveys, we discovered one new large super-fast rotator, (40511) 1999 RE88, and other 18 candidates. (40511) 1999 RE88 is an S-type inner main-belt asteroid with a diameter of D = 1.9 +- 0.3...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1608.07910
3
3.0
Jun 30, 2018
06/18
by
Chan-Kao Chang; Adam Waszczak; Hsing-Wen Lin; Wing-Huen Ip; Thomas. A. Prince; Shrinivas R. Kulkarni; Russ Laher; Jason Surace
texts
eye 3
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Asteroids of size larger than 150 m generally do not have rotation periods smaller than 2.2 hours. This spin cutoff is believed to be due to the gravitationally bound rubble-pile structures of the asteroids. Rotation with periods exceeding this critical value will cause asteroid breakup. Up until now, only one object, 2001 OE84, has been found to be an exception to this spin cutoff. We report the discovery of a new super-fast rotator, (335433) 2005 UW163, spinning with a period of 1.290 hours...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.8264
36
36
Jun 29, 2018
06/18
by
Adam Waszczak; Thomas A. Prince; Russ Laher; Frank Masci; Brian Bue; Umaa Rebbapragada; Tom Barlow; Jason Surace; George Helou; Shrinivas Kulkarni
texts
eye 36
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Near-Earth asteroids (NEAs) in the 1-100 meter size range are estimated to be $\sim$1,000 times more numerous than the $\sim$15,000 currently-catalogued NEAs, most of which are in the 0.5-10 kilometer size range. Impacts from 10-100 meter size NEAs are not statistically life-threatening but may cause significant regional damage, while 1-10 meter size NEAs with low velocities relative to Earth are compelling targets for space missions. We describe the implementation and initial results of a...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1609.08018
5
5.0
Jun 29, 2018
06/18
by
Kevin R. Covey; Marcel A. Agüeros; Nicholas M. Law; Jiyu Liu; Aida Ahmadi; Russ Laher; David Levitan; Branimir Sesar; Jason Surace
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eye 5
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Stellar rotation periods measured in open clusters have proved to be extremely useful for studying stars' angular momentum content and rotationally driven magnetic activity, which are both age- and mass-dependent processes. While period measurements have been obtained for hundreds of solar-mass members of the Pleiades, period measurements exist for only a few low-mass ($
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1601.07237
3
3.0
Jun 29, 2018
06/18
by
Chow-Choong Ngeow; Po-Chieh Yu; Eric Bellm; Ting-Chang Yang; Chan-Kao Chang; Adam Miller; Russ Laher; Jason Surace; Wing-Huen Ip
texts
eye 3
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The wide-field synoptic sky surveys, known as the Palomar Transient Factory (PTF) and the intermediate Palomar Transient Factory (iPTF), will accumulate a large number of known and new RR Lyrae. These RR Lyrae are good tracers to study the substructure of the Galactic halo if their distance, metallicity, and galactocentric velocity can be measured. Candidates of halo RR Lyrae can be identified from their distance and metallicity before requesting spectroscopic observations for confirmation....
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1612.03366
4
4.0
Jun 30, 2018
06/18
by
P. C. Yu; C. C. Lin; W. P. Chen; C. D. Lee; W. H. Ip; C. C. Ngeow; Russ Laher; Jason Surace; Shrinivas R. Kulkarni
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eye 4
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We present Be star candidates in the open cluster NGC\,663, identified by H$\alpha$ imaging photometry with the Palomar Transient Factory Survey, as a pilot program to investigate how the Be star phenomena, the emission spectra, extended circumstellar envelopes, and fast rotation, correlate with massive stellar evolution. Stellar membership of the candidates was verified by 2MASS magnitudes and colors, and by proper motions. We discover 4 new Be stars and exclude one known Be star from being a...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1411.5496
54
54
Sep 23, 2013
09/13
by
Sumin Tang; Yi Cao; Lars Bildsten; Peter Nugent; Eric Bellm; Shrinivas R. Kulkarni; Russ Laher; David Levitan; Frank Masci; Eran O. Ofek; Thomas A. Prince; Branimir Sesar; Jason Surace
texts
eye 54
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We report the discovery of R Coronae Borealis (RCB) stars in the Andromeda galaxy (M31) using the Palomar Transient Factory (PTF). RCB stars are rare hydrogen-deficient, carbon-rich supergiant variables, most likely the merger products of two white dwarfs. These new RCBs, including two confirmed ones and two candidates, are the first to be found beyond the Milky Way and the Magellanic Clouds. All of M31 RCBs showed >1.5 mag irregular declines over timescales of weeks to months. Due to the...
Source: http://arxiv.org/abs/1303.1820v2
5
5.0
Jun 29, 2018
06/18
by
Daniel A. Perley; Robert Quimby; Lin Yan; Paul Vreeswijk; Annalisa De Cia; Ragnhild Lunnan; Avishay Gal-Yam; Ofer Yaron; Alexei V. Filippenko; Melissa L. Graham; Russ Laher; Peter E. Nugent
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eye 5
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We present ultraviolet through near-infrared photometry and spectroscopy of the host galaxies of all superluminous supernovae (SLSNe) discovered by the Palomar Transient Factory prior to 2013, and derive measurements of their luminosities, star-formation rates, stellar masses, and gas-phase metallicities. We find that Type I (hydrogen-poor) SLSNe are found almost exclusively in low-mass (M < 2x10^9 M_sun) and metal-poor (12+log[O/H] < 8.4) galaxies. We compare the mass and metallicity...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1604.08207
21
21
Jun 27, 2018
06/18
by
Adam Waszczak; Chan-Kao Chang; Eran O. Ofek; Russ Laher; Frank Masci; David Levitan; Jason Surace; Yu-Chi Cheng; Wing-Huen Ip; Daisuke Kinoshita; George Helou; Thomas A. Prince; Shrinivas Kulkarni
texts
eye 21
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We fit 54,296 sparsely-sampled asteroid lightcurves in the Palomar Transient Factory to a combined rotation plus phase-function model. Each lightcurve consists of 20+ observations acquired in a single opposition. Using 805 asteroids in our sample that have reference periods in the literature, we find the reliability of our fitted periods is a complicated function of the period, amplitude, apparent magnitude and other attributes. Using the 805-asteroid ground-truth sample, we train an automated...
Topics: Astrophysics, Earth and Planetary Astrophysics
Source: http://arxiv.org/abs/1504.04041
51
51
Sep 23, 2013
09/13
by
David Levitan; Thomas Kupfer; Paul J. Groot; Shrinivas R. Kulkarni; Thomas A. Prince; Gregory V. Simonian; Iair Arcavi; Joshua S. Bloom; Russ Laher; Peter E. Nugent; Eran O. Ofek; Branimir Sesar; Jason Surace
texts
eye 51
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We present five new outbursting AM CVn systems and one candidate discovered as part of an ongoing search for such systems using the Palomar Transient Factory (PTF). This is the first large-area, systematic search for AM CVn systems using only large-amplitude photometric variability to select candidates. Three of the confirmed systems and the candidate system were discovered as part of the PTF transient search. Two systems were found as part of a search for outbursts through the PTF photometric...
Source: http://arxiv.org/abs/1212.5312v1
13
13
Jun 28, 2018
06/18
by
Chan-Kao Chang; Wing-Huen Ip; Hsing-Wen Lin; Yu-Chi Cheng; Chow-Choong Ngeow; Ting-Chang Yang; Adam Waszczak; Shrinivas R. Kulkarni; David Levitan; Branimir Sesar; Russ Laher; Jason Surace; Thomas. A. Prince
texts
eye 13
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Two dedicated asteroid rotation-period surveys have been carried out using data taken on January 6-9 and February 20-23 of 2014 by the Intermediate Palomar Transient Factory (iPTF) in the $R$~band with $\sim 20$-min cadence. The total survey area covered 174~deg$^2$ in the ecliptic plane. Reliable rotation periods for 1,438 asteroids are obtained from a larger data set of 6,551 mostly main-belt asteroids, each with $\geq 10$~detections. Analysis of 1751, PTF based, reliable rotation periods...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1506.08493
4
4.0
Jun 30, 2018
06/18
by
David Levitan; Thomas Kupfer; Paul J. Groot; Bruce Margon; Thomas A. Prince; Shrinivas R. Kulkarni; Gregg Hallinan; Leon K. Harding; Gillian Kyne; Russ Laher; Eran O. Ofek; René G. M. Rutten; Branimir Sesar; Jason Surace
texts
eye 4
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We report on PTF1 J191905.19+481506.2, a newly discovered, partially eclipsing, outbursting AM CVn system found in the Palomar Transient Factory synoptic survey. This is only the second known eclipsing AM CVn system. We use high-speed photometric observations and phase-resolved spectroscopy to establish an orbital period of 22.4559(3) min. We also present a long-term light curve and report on the normal and super-outbursts regularly seen in this system, including a super-outburst recurrence...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1402.7129
8
8.0
Jun 30, 2018
06/18
by
Chan-Kao Chang; Wing-Huen Ip; Hsing-Wen Lin; Yu-Chi Cheng; Chow-Choong Ngeow; Ting-Chang Yang; Adam Waszczak; Shrinivas R. Kulkarni; David Levitan; Branimir Sesar; Russ Laher; Jason Surace; Thomas. A. Prince; the PTF Team
texts
eye 8
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A new asteroid rotation period survey have been carried out by using the Palomar Transient Factory (PTF). Twelve consecutive PTF fields, which covered an area of 87 deg$^2$ in the ecliptic plane, were observed in $R$ band with a cadence of $\sim$20 min during February 15--18, 2013. We detected 2500 known asteroids with a diameter range of 0.5 km $\leq D \leq$ 200 km. Of these, 313 objects had highly reliable rotation periods and exhibited the "spin barrier" at $\sim2$ hours. In...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1405.1144
18
18
Jun 28, 2018
06/18
by
Nora L. Strotjohann; Eran O. Ofek; Avishay Gal-Yam; Mark Sullivan; Shrinivas R. Kulkarni; Nir J. Shaviv; Christoffer Fremling; Mansi M. Kasliwal; Peter E. Nugent; Yi Cao; Iair Arcavi; Jesper Sollerman; Alexei V. Filippenko; Ofer Yaron; Russ Laher; Jason Surace
texts
eye 18
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The progenitor stars of several Type IIb supernovae (SNe) show indications for extended hydrogen envelopes. These envelopes might be the outcome of luminous energetic pre-explosion events, so-called precursor eruptions. We use the Palomar Transient Factory (PTF) pre-explosion observations of a sample of 27 nearby Type IIb SNe to look for such precursors during the final years prior to the SN explosion. No precursors are found when combining the observations in 15-day bins, and we calculate the...
Topics: High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1508.04775
6
6.0
Jun 29, 2018
06/18
by
Frank Masci; Russ Laher; Umaa Rebbapragada; Gary Doran; Adam Miller; Eric Bellm; Mansi Kasliwal; Eran Ofek; Jason Surace; David Shupe; Carl Grillmair; Ed Jackson; Tom Barlow; Lin Yan; Yi Cao; S. Bradley Cenko; Lisa Storrie-Lombardi; George Helou; Thomas Prince; Shrinivas Kulkarni
texts
eye 6
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We describe the near real-time transient-source discovery engine for the intermediate Palomar Transient Factory (iPTF), currently in operations at the Infrared Processing and Analysis Center (IPAC), Caltech. We coin this system the IPAC/iPTF Discovery Engine (or IDE). We review the algorithms used for PSF-matching, image subtraction, detection, photometry, and machine-learned (ML) vetting of extracted transient candidates. We also review the performance of our ML classifier. For a limiting...
Topics: Astrophysics, Instrumentation and Methods for Astrophysics
Source: http://arxiv.org/abs/1608.01733
12
12
Jun 30, 2018
06/18
by
Sumin Tang; Lars Bildsten; William M. Wolf; K. L. Li; Albert K. H. Kong; Yi Cao; S. Bradley Cenko; Annalisa De Cia; Mansi M. Kasliwal; Shrinivas R. Kulkarni; Russ Laher; Frank Masci; Peter E. Nugent; Daniel A. Perley; Thomas A. Prince; Jason Surace
texts
eye 12
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The iPTF detection of the most recent outburst of the recurrent nova system RX J0045.4+4154 in the Andromeda Galaxy has enabled the unprecedented study of a massive ($M>1.3\ M_\odot$) accreting white dwarf (WD). We detected this nova as part of the near daily iPTF monitoring of M31 to a depth of $R\approx 21$\,mag and triggered optical photometry, spectroscopy and soft X-ray monitoring of the outburst. Peaking at an absolute magnitude of $M_R=-6.6$ mag, and with a decay time of 1 mag per...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1401.2426
5
5.0
Jun 29, 2018
06/18
by
Thomas Kupfer; Jan van Roestel; Jared Brooks; Stephan Geier; Tom R. Marsh; Paul J. Groot; Steven Bloemen; Thomas A. Prince; Eric Bellm; Ulrich Heber; Lars Bildsten; Adam A. Miller; Martin J. Dyer; Vik S. Dhillon; Matthew Green; Puji Irawati; Russ Laher; Stuart P. Littlefair; David L. Shupe; Charles C. Steidel; Somsawat Rattansoon; Max Pettini
texts
eye 5
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We present the discovery of the hot subdwarf B star (sdB) binary PTF1 J082340.04+081936.5. The system has an orbital period P$_{\rm orb}=87.49668(1)$ min (0.060761584(10) days), making it the second-most compact sdB binary known. The lightcurve shows ellipsoidal variations. Under the assumption that the sdB primary is synchronized with the orbit, we find a mass $M_{\rm sdB}=0.45^{+0.09}_{-0.07}$ M$_\odot$, a companion white dwarf mass $M_{\rm WD}=0.46^{+0.12}_{-0.09}$ M$_\odot$ and a mass ratio...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1612.02019
6
6.0
Jun 29, 2018
06/18
by
Po-Chieh Yu; Chien-Cheng Lin; Hsing-Wen Lin; Chien-De Lee; Nick Konidaris; Chow-Choong Ngeow; Wing-Huen Ip; Wen-Ping Chen; Hui-Chen Chen; Matthew A. Malkan; Chan-Kao Chang; Russ Laher; Li-Ching Huang; Yu-Chi Cheng; Rick Edelson; Andreas Ritter; Robert Quimby; Sagi Ben-Ami; Eran. O. Ofek; Jason Surace; Shrinivas R. Kulkarni
texts
eye 6
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We report the discovery of 2 new Be stars, and re-identify one known Be star in the open cluster NGC 6830. Eleven H-alpha emitters were discovered using the H-alpha imaging photometry of the Palomar Transient Factory Survey. Stellar membership of the candidates was verified with photometric and kinematic information using 2MASS data and proper motions. The spectroscopic confirmation was carried out by using the Shane 3-m telescope at Lick observatory. Based on their spectral types, three...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1604.02276
13
13
Jun 30, 2018
06/18
by
Paul M. Vreeswijk; Sandra Savaglio; Avishay Gal-Yam; Annalisa De Cia; Robert M. Quimby; Mark Sullivan; S. Bradley Cenko; Daniel A. Perley; Alexei V. Filippenko; Kelsey I. Clubb; Francesco Taddia; Jesper Sollerman; Giorgos Leloudas; Iair Arcavi; Adam Rubin; Mansi M. Kasliwal; Yi Cao; Ofer Yaron; David Tal; Eran O. Ofek; John Capone; Alexander S. Kutyrev; Vicki Toy; Peter E. Nugent; Russ Laher; Jason Surace; Shrinivas R. Kulkarni
texts
eye 13
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We present imaging and spectroscopy of a hydrogen-poor superluminous supernova (SLSN) discovered by the intermediate Palomar Transient Factory: iPTF13ajg. At a redshift of z=0.7403, derived from narrow absorption lines, iPTF13ajg peaked at an absolute magnitude M(u,AB)=-22.5, one of the most luminous supernovae to date. The uBgRiz light curves, obtained with the P48, P60, NOT, DCT, and Keck telescopes, and the nine-epoch spectral sequence secured with the Keck and the VLT (covering 3 rest-frame...
Topics: Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Astrophysics, Cosmology and...
Source: http://arxiv.org/abs/1409.8287
5
5.0
Jun 29, 2018
06/18
by
Paul M. Vreeswijk; Giorgos Leloudas; Avishay Gal-Yam; Annalisa De Cia; Daniel A. Perley; Robert M. Quimby; Roni Waldman; Mark Sullivan; Lin Yan; Eran O. Ofek; Christoffer Fremling; Francesco Taddia; Jesper Sollerman; Stefano Valenti; Iair Arcavi; D. Andrew Howell; Alexei V. Filippenko; S. Bradley Cenko; Ofer Yaron; Mansi M. Kasliwal; Yi Cao; Sagi Ben-Ami; Assaf Horesh; Adam Rubin; Ragnhild Lunnan; Peter E. Nugent; Russ Laher; Umaa D. Rebbapragada; Przemysław Woźniak; Shrinivas R. Kulkarni
texts
eye 5
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We present the light curves of the hydrogen-poor superluminous supernovae (SLSNe-I) PTF12dam and iPTF13dcc, discovered by the (intermediate) Palomar Transient Factory. Both show excess emission at early times and a slowly declining light curve at late times. The early bump in PTF12dam is very similar in duration (~10 days) and brightness relative to the main peak (2-3 mag fainter) compared to those observed in other SLSNe-I. In contrast, the long-duration (>30 days) early excess emission in...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Cosmology and Nongalactic Astrophysics, Solar...
Source: http://arxiv.org/abs/1609.08145
3
3.0
Jun 29, 2018
06/18
by
Griffin Hosseinzadeh; Iair Arcavi; Stefano Valenti; Curtis McCully; D. Andrew Howell; Joel Johansson; Jesper Sollerman; Andrea Pastorello; Stefano Benetti; Yi Cao; S. Bradley Cenko; Kelsey Clubb; Alessandra Corsi; Gina Duggan; Nancy Elias-Rosa; Alexei V. Filippenko; Ori D. Fox; Christoffer Fremling; Assaf Horesh; Emir Karamehmetoglu; Mansi Kasliwal; G. H. Marion; Eran Ofek; David Sand; Francesco Taddia; WeiKang Zheng; Morgan Fraser; Avishay Gal-Yam; Cosimo Inserra; Russ Laher; Frank Masci; Umaa...
texts
eye 3
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Type Ibn supernovae (SNe) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrogen. The prevailing theory has been that these are the core-collapse explosions of very massive stars embedded in helium-rich circumstellar material (CSM). We report optical observations of six new SNe Ibn: PTF11rfh, PTF12ldy, iPTF14aki, iPTF15ul, SN 2015G, and iPTF15akq. This brings the sample size of such objects in...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1608.01998
71
71
Sep 21, 2013
09/13
by
Julian C. van Eyken; David R. Ciardi; Luisa M. Rebull; John R. Stauffer; Rachel L. Akeson; Charles A. Beichman; Andrew F. Boden; Kaspar von Braun; Dawn M. Gelino; D. W. Hoard; Steve B. Howell; Stephen R. Kane; Peter Plavchan; Solange V. Ramírez; Joshua S. Bloom; S. Bradley Cenko; Mansi M. Kasliwal; Shrinivas R. Kulkarni; Nicholas M. Law; Peter E. Nugent; Eran O. Ofek; Dovi Poznanski; Robert M. Quimby; Carl J. Grillmair; Russ Laher; David Levitan; Sean Mattingly; Jason A. Surace
texts
eye 71
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The Palomar Transient Factory (PTF) Orion project is an experiment within the broader PTF survey, a systematic automated exploration of the sky for optical transients. Taking advantage of the wide field of view available using the PTF camera at the Palomar 48" telescope, 40 nights were dedicated in December 2009-January 2010 to perform continuous high-cadence differential photometry on a single field containing the young (7-10Myr) 25 Ori association. The primary motivation for the project...
Source: http://arxiv.org/abs/1106.3570v2
17
17
Jun 28, 2018
06/18
by
Adam D. Myers; Nathalie Palanque-Delabrouille; Abhishek Prakash; Isabelle Pâris; Christophe Yeche; Kyle S. Dawson; Jo Bovy; Dustin Lang; David J. Schlegel; Jeffrey A. Newman; Patrick Petitjean; Jean Paul Kneib; Pierre Laurent; Will J. Percival; Ashley J. Ross; Hee-Jong Seo; Jeremy L. Tinker; Eric Armengaud; Joel Brownstein; Etienne Burtin; Zheng Cai; Johan Comparat; Mansi Kasliwal; Shrinivas R. Kulkarni; Russ Laher; David Levitan; Cameron K. McBride; Ian D. McGreer; Adam A. Miller; Peter...
texts
eye 17
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As part of the Sloan Digital Sky Survey IV the extended Baryon Oscillation Spectroscopic Survey (eBOSS) will improve measurements of the cosmological distance scale by applying the Baryon Acoustic Oscillation (BAO) method to quasar samples. eBOSS will adopt two approaches to target quasars over 7500 sq. deg. First, a "CORE" quasar sample will combine optical selection in ugriz using a likelihood-based routine called XDQSOz, with a mid-IR-optical color-cut. eBOSS CORE selection (to g...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1508.04472
22
22
Jun 27, 2018
06/18
by
S. Bradley Cenko; Alex L. Urban; Daniel A. Perley; Assaf Horesh; Alessandra Corsi; Derek B. Fox; Yi Cao; Mansi M. Kasliwal; Amy Lien; Iair Arcavi; Joshua S. Bloom; Nat R. Butler; Antonino Cucchiara; Jose A. de Diego; Alexei V. Filippenko; Avishay Gal-Yam; Neil Gehrels; Leonid Georgiev; J. Jesus Gonzalez; John F. Graham; Jochen Greiner; D. Alexander Kann; Christopher R. Klein; Fabian Knust; S. R. Kulkarni; Alexander Kutyrev; Russ Laher; William H. Lee; Peter E. Nugent; J. Xavier Prochaska;...
texts
eye 22
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We report here the discovery by the Intermediate Palomar Transient Factory (iPTF) of iPTF14yb, a luminous ($M_{r}\approx-27.8$ mag), cosmological (redshift 1.9733), rapidly fading optical transient. We demonstrate, based on probabilistic arguments and a comparison with the broader population, that iPTF14yb is the optical afterglow of the long-duration gamma-ray burst GRB 140226A. This marks the first unambiguous discovery of a GRB afterglow prior to (and thus entirely independent of) an...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1504.00673
