Search Publications
The New EXor Outburst of ESO-Hα 99 Observed by Gaia ATLAS and TESS
Kochanek, C. S.; Tonry, John; Vallely, Patrick J. +11 more
We report photometry and spectroscopy of the outburst of the young stellar object ESO-Hα99. The outburst was first noticed in Gaia alert Gaia18dvc and later by the Asteroid Terrestrial-impact Last Alert System (ATLAS). We have established the outburst light curve with archival ATLAS orange filter photometry, Gaia data, new V-band photometry, and J…
Two Jovian Planets around the Giant Star HD 202696: A Growing Population of Packed Massive Planetary Pairs around Massive Stars?
Trifonov, Trifon; Stock, Stephan; Henning, Thomas +6 more
We present evidence for a new two-planet system around the giant star HD 202696 (=HIP 105056, BD +26 4118). The discovery is based on public HIRES radial velocity (RV) measurements taken at Keck Observatory between 2007 July and 2014 September. We estimate a stellar mass of {1.91}-0.14+0.09{M}⊙ for HD 202696, whic…
Global Parameters of 12 Totally Eclipsing W UMa Stars
Popov, Velimir A.; Petrov, Nikola I.; Kjurkchieva, Diana P.
Photometric observations of 12 totally eclipsing W UMa binaries (NSVS 3325547, V646 Lac, V1320 Cas, V539 Dra, V816 Cep, NSVS 9045055, V1115 Cas, V902 Cep, V596 Peg, NSVS 1768818, V619 Peg, and NSVS 3198272) are presented. We found that the longer (in phase units) the flat eclipses are, the smaller the mass ratios (or the reciprocal values) are. Th…
HATS-54b-HATS-58Ab: Five New Transiting Hot Jupiters Including One with a Possible Temperate Companion
Henning, T.; Mancini, L.; Rabus, M. +18 more
We report the discovery by the HATSouth project of five new transiting hot Jupiters (HATS-54b through HATS-58Ab). HATS-54b, HATS-55b, and HATS-58Ab are prototypical short-period (P = 2.5-4.2 days, R p ∼ 1.1-1.2 {R}{{J}}) hot Jupiters that span effective temperatures from 1350 to 1750 K, putting them in the proposed region o…
Shallow Ultraviolet Transits of WD 1145+017
Vanderburg, Andrew; Muirhead, Philip S.; Hallakoun, Na'ama +16 more
WD 1145+017 is a unique white dwarf system that has a heavily polluted atmosphere, an infrared excess from a dust disk, numerous broad absorption lines from circumstellar gas, and changing transit features, likely from fragments of an actively disintegrating asteroid. Here, we present results from a large photometric and spectroscopic campaign wit…
High-resolution Thermal Infrared Imaging of 3200 Phaethon
Jewitt, David; Li, Jing; Asmus, Daniel +1 more
We present thermal infrared observations of the active asteroid (and Geminid meteoroid stream parent) 3200 Phaethon using the Very Large Telescope. The images, at 10.7 µm wavelength, were taken with Phaethon at its closest approach to Earth (separation of 0.07 au) in 2017 December, at a linear resolution of about 14 km. We probe the Hill sph…
VLT/SPHERE Multiwavelength High-contrast Imaging of the HD 115600 Debris Disk: New Constraints on the Dust Geometry and the Presence of Young Giant Planets
Currie, Thayne; Wagner, Kevin; Moór, Attila +5 more
Young and dynamically active planetary systems can form disks of debris that are easier to image than the planets themselves. The morphology and evolution of these disks can help to infer the properties of the putative planets responsible for generating and shaping the debris structures. We present integral field spectroscopy and dual-band imaging…
Searching for Black Hole Candidates by LAMOST and ASAS-SN
Liu, Jifeng; Bai, Yu; Gu, Wei-Min +13 more
Most dynamically confirmed stellar-mass black holes (BHs) and their candidates were originally selected from X-ray outbursts. In the present work, we search for BH candidates in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey using the spectra along with photometry from the All Sky Automated Survey for SuperNovae (ASA…
Extended X-Ray Study of M49: The Frontier of the Virgo Cluster
Mernier, F.; Churazov, E.; Maccarone, T. J. +10 more
The M49 group, residing outside the virial radius of the Virgo cluster, is falling onto the cluster from the south. We report results from deep XMM-Newton mosaic observations of M49. Its hot gas temperature is 0.8 keV at the group center and rises to 1.5 keV beyond the brightest group galaxy (BGG). The group gas extends to radii of ∼300 kpc to the…
An 11 Earth-mass, Long-period Sub-Neptune Orbiting a Sun-like Star
López-Morales, Mercedes; Latham, David W.; Mayo, Andrew W. +27 more
Although several thousands of exoplanets have now been detected and characterized, observational biases have led to a paucity of long-period, low-mass exoplanets with measured masses and a corresponding lag in our understanding of such planets. In this paper we report the mass estimation and characterization of the long-period exoplanet Kepler-538…