Search Publications
Multiwavelength Modeling the SED of Luminous Supersoft X-Ray Sources in Large Magellanic Cloud and Small Magellanic Cloud
Skopal, Augustin
Classical supersoft X-ray sources (SSSs) are understood as close binary systems in which a massive white dwarf accretes from its companion at rates sustaining steady hydrogen burning on its surface generating bolometric luminosities of 1036-2 × 1038 erg s-1. Here, we perform for the first time the global supersoft …
VLA Observations of the AE Aqr-type Cataclysmic Variable LAMOST J024048.51+195226.9
Barrett, Paul E.
AE Aqr was until recently the only known magnetic cataclysmic variable (MCV) containing a rapidly spinning (33.08 s) white dwarf (WD). Its radio emission is believed to be a superposition of synchrotron-emitting plasmoids, because it has a positive spectral index spanning three orders of magnitude (≈2-2000 GHz) and is unpolarized. Both characteris…
A CHEOPS Search for Massive, Long-period Companions to the Warm Jupiter K2-139 b
Smith, Alexis M. S.; Csizmadia, Szilárd
K2-139 b is a warm Jupiter with an orbital period of 28.4 days, but only three transits of this system have previously been observed-in the long-cadence mode of K2-limiting the precision with which the orbital period can be determined and future transits predicted. We report photometric observations of four transits of K2-139 b with ESA's CHaracte…
Optical Linear Polarization Study toward Czernik 3 Open Cluster at Different Spatial Scales
Bisht, D.; Ganesh, Shashikiran; Uppal, Namita
We present the optical linear polarization observation of stars toward the core of the Czernik 3 cluster in the Sloan i band. The data were obtained using the EMPOL instrument on the 1.2 m telescope at Mount Abu Observatory. We study the dust distribution toward this cluster by combining the results from our polarization observations with the data…
The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-mass Outer Companion around TOI-1272
Batalha, Natalie M.; Bieryla, Allyson; Latham, David W. +58 more
We report the discovery of an eccentric hot Neptune and a non-transiting outer planet around TOI-1272. We identified the eccentricity of the inner planet, with an orbital period of 3.3 days and R p,b = 4.1 ± 0.2 R ⊕, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. Usin…
The Dust Mass of Supernova Remnants in M31
Ren, Yi; Jiang, Biwei; Zhao, He +2 more
The dust temperature and mass of the supernova remnants (SNRs) in M31 are estimated by fitting the infrared spectral energy distribution calculated from the images in the Spitzer/IRAC4 and MIPS24, Herschel/PACS70, 100, and 160, and Herschel/SPIRE 250 and 350 µm bands. Twenty SNRs with relatively reliable photometry exhibit an average dust te…
A New Detached Binary USNO-B1.0 1421-0485411 with the Secondary Component having Large Albedo
Wang, Xiaobin; Xiang, Yue; Gu, Shenghong +11 more
USNO-B1.0 1421-0485411 is an eclipsing binary system newly discovered in the Yunnan-Hong Kong wide-field photometric survey. Its orbital period is 1.295 days. Based on the V- and R-band photometric data collected at Kunming 1.0 m telescope and spectroscopic data observed at Lijiang 2.4 m telescope, we used the Wilson-Devinney program to determine …
A Silent Revolution in Fundamental Astrophysics
Bakış, Volkan; Bilir, Selçuk; Soydugan, Faruk +2 more
Arbitrariness in the zeropoint of bolometric corrections is a paradigm that is nearly a century old and leads to two more paradigms. "Bolometric corrections must always be negative," and "the bolometric magnitude of a star ought to be brighter than its V magnitude". Both were considered valid before the IAU 2015 General Assembly Resolution B2, a r…
An Imaging Search for Post-main-sequence Planets of Sirius B
Lucas, Miles; Ruane, Garreth; Bottom, Michael +1 more
We present deep imaging of Sirius B, the closest and brightest white dwarf, to constrain post-main-sequence planetary evolution in the Sirius system. We use Keck/NIRC2 in L' band (3.776 µm) across three epochs in 2020 using the technique of angular differential imaging. Our observations are speckle-limited out to 1 au and background-limited …
The First High-contrast Images of X-Ray Binaries: Detection of Candidate Companions in the γ Cas Analog RX J1744.7-2713
Fabian, A. C.; Gandhi, P.; Mawet, D. +17 more
X-ray binaries provide exceptional laboratories for understanding the physics of matter under the most extreme conditions. Until recently, there were few, if any, observational constraints on the circumbinary environments of X-ray binaries at ~100-5000 au scales. It remains unclear how the accretion onto the compact objects or the explosions givin…