91
91
Sep 18, 2013
09/13
by
Ing-Guey Jiang; Wing-Huen Ip
texts
eye 91
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The bright F8 V solar-type star upsilon Andromedae has recently been reported to have a system of three planets of Jovian masses. In order to investigate the orbital stability and mutual gravitational interactions among these extrasolar planets, both forward and backward integrations from the latest observed orbital elements for all three planets' orbits have been performed under the coplanar assumption. We reconfirm that the middle and the outer planet have strong interaction leading to large...
Source: http://arxiv.org/abs/astro-ph/0008174v2
3
3.0
Jun 28, 2018
06/18
by
Chan-Kao Chang; Hsing-Wen Lin; Wing-Huen Ip
texts
eye 3
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Rotation period clustering in prograde/retrograde rotators might indicate the preliminary indication of the Slivan state in the Koronis family as a result of the YORP effect. We follow the general scenario of dispersion in semimajor axis of the asteroid family members to separate prograde and retrograde rotators in the Koronis family. From the available rotation periods obtained from PTF/iPTF, we can not found the rotation period clustering of objects with H grater than 12 mag in the Koronis...
Topics: Astrophysics, Earth and Planetary Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1511.05640
47
47
Sep 18, 2013
09/13
by
Ping-Hung Kuo; Chorng-Yuan Hwang; Wing-Huen Ip
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eye 47
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We investigate theoretical models for the radio halo and hard X-ray (HXR) excess in the Coma galaxy cluster. Time-independent and time-dependent re-acceleration models for relativistic electrons have been carried out to study the formation of the radio halo and HXR excess. In these models, the relativistic electrons are injected by merger shocks and re-accelerated by ensuing violent turbulence. The effects of different Mach numbers of the merger shocks on the radio and HXR excess emission are...
Source: http://arxiv.org/abs/astro-ph/0306488v1
57
57
Sep 19, 2013
09/13
by
Ing-Guey Jiang; Wing-Huen Ip; Li-Chin Yeh
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eye 57
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It has been shown that there is a possible mass-period correlation for extrasolar planets from the current observational data and this correlation is, in fact, related to the absence of massive close-in planets, which are strongly influenced by the tidal interaction with the central star. We confirm that the model in P\"atzold & Rauer (2002) is a good approximation for the explanation of the absence of massive close-in planets. We thus further determine the minimum possible semimajor...
Source: http://arxiv.org/abs/astro-ph/0209061v1
61
61
Sep 22, 2013
09/13
by
Chih Hao Hsia; Wing Huen Ip; Jin Zeng Li
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eye 61
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The young planetary nebulae play an important role in stellar evolution when intermediate- to low-mass stars (0.8 $\sim$ 8 M$_\odot$) evolve from the proto-planetary nebulae phase to the planetary nebulae phase. Many young planetary nebulae display distinct bipolar structures as they evolve away from the proto-planetary nebulae phase. One possible cause of their bipolarity could be due to a binary origin of its energy source. Here we report our detailed investigation of the young planetary...
Source: http://arxiv.org/abs/astro-ph/0603224v1
38
38
Sep 21, 2013
09/13
by
Chih Hao Hsia; Jin Zeng Li; Wing-Huen Ip
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eye 38
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Here we present initial results of our search for extensive halos around the planetary nebulae (PNe) in our Galaxy based on imaging data from the Southern H-Alpha Sky Survey Atlas (SHASSA). A threshold surface brightness in H$\alpha$ emission was used to help identify the spatially extended features of the PNe. We investigated a sample that included 10 PNe, the large majority of which were found to be surrounded by extensive outer halos. The formation of these halos might be closely related to...
Source: http://arxiv.org/abs/0712.2639v1
53
53
Sep 23, 2013
09/13
by
Ping-Hung Kuo; Chorng-Yuan Hwang; Wing-Huen Ip
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eye 53
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We investigate the evolution and number distribution of radio halos in galaxy clusters. Without re-acceleration or regeneration, the relativistic electrons responsible for the diffuse radio emission will lose their energy via inverse-Compton and synchrotron losses in a rather short time, and radio halos will have lifetimes $\sim$ 0.1 Gyr. Radio halos could last for $\sim$ Gyr if a significant level of re-acceleration is involved. The lifetimes of radio halos would be comparable with the...
Source: http://arxiv.org/abs/astro-ph/0312226v2
15
15
Jun 27, 2018
06/18
by
Yuhui Zhao; Jianghui Ji; Jiangchuan Huang; Shoucun Hu; Xiyun Hou; Yuan Li; Wing-Huen Ip
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eye 15
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In this work, we investigate the rotational dynamics of the ginger-shaped near-Earth asteroid 4179 Toutatis, which was closely observed by Chang'e-2 at a distance of $770\pm120~$ meters from the asteroid's surface during the outbound flyby \citep{Huang2013} on 13 December 2012. A sequence of high-resolution images was acquired during the flyby mission. In combination with ground-based radar observations collected over the last two decades, we analyze these flyby images and determine the...
Topics: Astrophysics, Earth and Planetary Astrophysics
Source: http://arxiv.org/abs/1504.02024
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
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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
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
60
60
Sep 20, 2013
09/13
by
Fumi Yoshida; Takashi Ito; Budi Dermawan; Tsuko Nakamura; Shigeru Takahashi; Mansur A. Ibrahimov; Renu Malhotra; Wing Huen Ip; Wen Ping Chen; Yu Sawabe; Masashige Haji; Ryoko Saito; Masanori Hirai
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eye 60
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The Karin family is a very young asteroid family created by an asteroid breakup 5.8 Myr ago. Since the members of this family probably have not experienced significant orbital or collisional evolution yet, it is possible that they still preserve properties of the original family-forming event in terms of their spin state. As we carried out a series of photometric observations of the Karin family asteroids, here we report an analysis result of lightcurves including the rotation period of eleven...
Source: http://arxiv.org/abs/1205.2837v2
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
76
76
Sep 19, 2013
09/13
by
Yuji Urata; Kuiyun Huang; Myungshin Im; Induk Lee; Jinsong Deng; Wing-Huen Ip; Hans Krimm; Xin Liping; Masanori Ohno; Yulei Qiu; Satoshi Sugita; Makoto Tashiro; Jianyan Wei; Kazutaka Yamaoka; Weikang Zheng
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eye 76
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We present multi-band results for GRB071010B based on \Swift, \Suzaku, and ground-based optical observations. This burst is an ideal target to evaluate the robustness of the ${\rm E^{src}_{peak}-E_{iso}}$ and ${\rm E^{src}_{peak}-E_{\gamma}}$ relations, whose studies have been in stagnation due to the lack of the combined estimation of $\rm E^{src}_{peak}$ and long term optical monitoring. The joint prompt spectral fitting using \Swift/Burst Alert Telescope and \Suzaku/Wide-band All sky Monitor...
Source: http://arxiv.org/abs/0910.5774v1
18
18
Jun 26, 2018
06/18
by
Chow-Choong Ngeow; Chien-Hsiu Lee; Michael Ting-Chang Yang; Chi-Sheng Lin; Hsiang-Yao Hsiao; Yu-Chi Cheng; Zhong-Yi Lin; I-Ling Lin; Shashi M. Kanbur; Wing-Huen Ip
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eye 18
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The ultra-long period Cepheids (ULPCs) are classical Cepheids with pulsation periods exceeding $\approx 80$ days. The intrinsic brightness of ULPCs are ~1 to ~3 mag brighter than their shorter period counterparts. This makes them attractive in future distance scale work to derive distances beyond the limit set by the shorter period Cepheids. We have initiated a program to search for ULPCs in M31, using the single-band data taken from the Palomar Transient Factory, and identified eight possible...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1501.02456
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
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
3
3.0
Jun 29, 2018
06/18
by
Chin-Ping Hu; Ting-Chang Yang; Yi Chou; L. Liu; S. -B. Qian; C. Y. Hui; Albert K. H. Kong; L. C. C. Lin; P. H. T. Tam; K. L. Li; Chow-Choong Ngeow; W. P. Chen; Wing-Huen Ip
texts
eye 3
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We report the detection of orbital modulation, a model solution, and X-ray properties of a newly discovered contact binary, 2MASS J11201034$-$2201340. We serendipitously found this X-ray point source outside the error ellipse when searching for possible X-ray counterparts of $\gamma$-ray millisecond pulsars among the unidentified objects detected by the {\it Fermi Gamma-ray Space Telescope}. The optical counterpart of the X-ray source (unrelated to the $\gamma$-ray source) was then identified...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1604.05441
44
44
Sep 21, 2013
09/13
by
Yuji Urata; Kui-Yun Huang; Ping-Hung Kuo; Wing-Huen Ip; Yulei Qiu; Keisuke Masuno; Makoto Tashiro; Keichi Abe; Kaori Onda; Natsuki Kodaka; Makoto Kuwahara; Toru Tamagawa; Fumihiko Usui; Kunihito Ioka; Yi-Hsi Lee; Jianyan Wei; Jinsong Deng; Weikang Zheng; Kazuo Makishima
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eye 44
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Observations were made of the optical afterglow of GRB 051028 with the Lulin observatory's 1.0 m telescope and the WIDGET robotic telescope system. R band photometric data points were obtained on 2005 October 28 (UT), or 0.095-0.180 days after the burst. There is a possible plateau in the optical light curve around 0.1 days after the burst; the light curve resembles optically bright afterglows (e.g. GRB 041006, GRB 050319, GRB060605) in shape of the light curve but not in brightness. The...
Source: http://arxiv.org/abs/0706.0561v1
5
5.0
Jun 29, 2018
06/18
by
Ying-Tung Chen; Hsing Wen Lin; Matthew J. Holman; Matthew J. Payne; Wesley C. Fraser; Pedro Lacerda; Wing-Huen Ip; Wen-Ping Chen; Rolf-Peter Kudritzki; Robert Jedicke; Richard J. Wainscoat; John L. Tonry; Eugene A. Magnier; Christopher Waters; Nick Kaiser; Shiang-Yu Wang; Matthew Lehner
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eye 5
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Although the majority of Centaurs are thought to have originated in the scattered disk, with the high-inclination members coming from the Oort cloud, the origin of the high inclination component of trans-Neptunian objects (TNOs) remains uncertain. We report the discovery of a retrograde TNO, which we nickname "Niku", detected by the Pan-STARRS 1 Outer Solar System Survey. Our numerical integrations show that the orbital dynamics of Niku are very similar to that of 2008 KV$_{42}$...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1608.01808
5
5.0
Jun 29, 2018
06/18
by
Hsing Wen Lin; Ying-Tung Chen; Matthew J. Holman; Wing-Huen Ip; M. J. Payne; P. Lacerda; W. C. Fraser; D. W. Gerdes; A. Bieryla; Z. -F. Sie; W. -P. Chen; W. S. Burgett; L. Denneau; R. Jedicke; N. Kaiser; E. A. Magnier; J. L. Tonry; R. J. Wainscoat; C. Waters
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eye 5
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In this work we report the detection of seven Neptune Trojans (NTs) in the Pan-STARRS 1 (PS1) survey. Five of these are new discoveries, consisting of four L4 Trojans and one L5 Trojan. Our orbital simulations show that the L5 Trojan stably librates for only several million years. This suggests that the L5 Trojan must be of recent capture origin. On the other hand, all four new L4 Trojans stably occupy the 1:1 resonance with Neptune for more than 1 Gyr. They can, therefore, be of primordial...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1609.04677
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
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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
10
10.0
Jun 29, 2018
06/18
by
Michele T. Bannister; Mike Alexandersen; Susan D. Benecchi; Ying-Tung Chen; Audrey Delsanti; Wesley C. Fraser; Brett J. Gladman; Mikael Granvik; Will M. Grundy; Aurelie Guilbert-Lepoutre; Stephen D. J. Gwyn; Wing-Huen Ip; Marian Jakubik; R. Lynne Jones; Nathan Kaib; J. J. Kavelaars; Pedro Lacerda; Samantha Lawler; Matthew J. Lehner; Hsing Wen Lin; Patryk Sofia Lykawka; Michael Marsset; Ruth Murray-Clay; Keith S. Noll; Alex Parker; Jean-Marc Petit; Rosemary E. Pike; Philippe Rousselot; Megan E....
texts
eye 10
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We report the discovery and orbit of a new dwarf planet candidate, 2015 RR$_{245}$, by the Outer Solar System Origins Survey (OSSOS). 2015 RR$_{245}$'s orbit is eccentric ($e=0.586$), with a semi-major axis near 82 au, yielding a perihelion distance of 34 au. 2015 RR$_{245}$ has $g-r = 0.59 \pm 0.11$ and absolute magnitude $H_{r} = 3.6 \pm 0.1$; for an assumed albedo of $p_V = 12$% the object has a diameter of $\sim670$ km. Based on astrometric measurements from OSSOS and Pan-STARRS1, we find...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1607.06970
6
6.0
Jun 28, 2018
06/18
by
Michele T. Bannister; J. J. Kavelaars; Jean-Marc Petit; Brett J. Gladman; Stephen D. J. Gwyn; Ying-Tung Chen; Kathryn Volk; Mike Alexandersen; Susan Benecchi; Audrey Delsanti; Wesley Fraser; Mikael Granvik; Will M. Grundy; Aurelie Guilbert-Lepoutre; Daniel Hestroffer; Wing-Huen Ip; Marian Jakubik; Lynne Jones; Nathan Kaib; Catherine F. Kavelaars; Pedro Lacerda; Samantha Lawler; Matthew J. Lehner; Hsing Wen Lin; Tim Lister; Patryk Sofia Lykawka; Stephanie Monty; Michael Marsset; Ruth...
texts
eye 6
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We report the discovery, tracking and detection circumstances for 85 trans-Neptunian objects (TNOs) from the first 42 deg$^{2}$ of the Outer Solar System Origins Survey (OSSOS). This ongoing $r$-band Solar System survey uses the 0.9 deg$^{2}$ field-of-view MegaPrime camera on the 3.6 m Canada-France-Hawaii Telescope. Our orbital elements for these TNOs are precise to a fractional semi-major axis uncertainty $
Topics: Astrophysics, Earth and Planetary Astrophysics
Source: http://arxiv.org/abs/1511.02895
82
82
Sep 23, 2013
09/13
by
Henry H. Hsieh; Bin Yang; Nader Haghighipour; Heather M. Kaluna; Alan Fitzsimmons; Larry Denneau; Bojan Novakovic; Robert Jedicke; Richard J. Wainscoat; James D. Armstrong; Samuel R. Duddy; Stephen C. Lowry; Chadwick A. Trujillo; Marco Micheli; Jacqueline V. Keane; Laurie Urban; Timm Riesen; Karen J. Meech; Shinsuke Abe; Yu-Chi Cheng; Wen-Ping Chen; Mikael Granvik; Tommy Grav; Wing-Huen Ip; Daisuke Kinoshita; Jan Kleyna; Pedro Lacerda; Tim Lister; Andrea Milani; David J. Tholen; Peter Veres;...
texts
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Main belt asteroid (300163) 2006 VW139 (later designated P/2006 VW139) was discovered to exhibit comet-like activity by the Pan-STARRS1 survey telescope using automated point-spread-function analyses performed by PS1's Moving Object Processing System. Deep follow-up observations show both a short (\sim 10") antisolar dust tail and a longer (\sim 60") dust trail aligned with the object's orbit plane, similar to the morphology observed for another main-belt comet, P/2010 R2 (La Sagra),...
Source: http://arxiv.org/abs/1202.2126v1
