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TESS Reveals HD 118203 b to be a Transiting Planet
Vanderburg, Andrew; Latham, David W.; Kane, Stephen R. +34 more
The exoplanet HD 118203 b, orbiting a bright (V = 8.05) host star, was discovered using the radial velocity method by da Silva et al., but was not previously known to transit. Transiting Exoplanet Survey Satellite (TESS) photometry has revealed that this planet transits its host star. Nine planetary transits were observed by TESS, allowing us to m…
TOI-132 b: A short-period planet in the Neptune desert transiting a V = 11.3 G-type star★
Vanderburg, Andrew; Latham, David W.; Law, Nicholas M. +49 more
The Neptune desert is a feature seen in the radius-period plane, whereby a notable dearth of short period, Neptune-like planets is found. Here, we report the Transiting Exoplanet Survey Satellite (TESS) discovery of a new short-period planet in the Neptune desert, orbiting the G-type dwarf TYC 8003-1117-1 (TOI-132). TESS photometry shows transit-l…
A model for redistributing heat over the surface of irradiated spider companions
Clark, C. J.; Breton, R. P.; Kennedy, M. R. +2 more
Spider pulsars are binary systems containing an energetic millisecond pulsar that intensely irradiates a closely orbiting low-mass companion. Modelling their companion's optical light curves is essential to the study of the orbital properties of the binary, including the determination of the pulsar mass, characterizing the pulsar wind, and the sta…
The spin-orbit alignment of visual binaries
Albrecht, S.; Justesen, A. B.
Context. The angle between the stellar spin-axis and the orbital plane of a stellar or planetary companion has important implications for the formation and evolution of such systems. A study by Hale (1994, AJ, 107, 306) found that binaries with separations a ≲ 30 au are preferentially aligned while binaries on wider orbits are frequently misaligne…
Optical Observations Reveal Strong Evidence for High-energy Neutrino Progenitor
Rebolo, R.; Buckley, D. A. H.; Böttcher, M. +32 more
We present the earliest astronomical observation of a high-energy neutrino error box of which the variability was discovered after high-energy-neutrino detection. The one robotic telescope of the MASTER global international networks automatically imaged the error box of the very high-energy-neutrino event IceCube-170922A. Observations were carried…
FEDReD. II. 3D extinction map with 2MASS and Gaia DR2 data
Arenou, F.; Babusiaux, C.; Hottier, C.
Aims: We aim to map the 3D distribution of the interstellar extinction of the Milky Way disc up to distances larger than those probed with the Gaia parallax alone.
Methods: We applied the FEDReD (Field Extinction-Distance Relation Deconvolver) algorithm to the 2MASS near-infrared photometry together with the Gaia DR2 astrometry and photo…
Ondřejov Echelle Spectrograph, Ground Based Support Facility for Exoplanet Missions
Sabotta, S.; Skarka, M.; Kabáth, P. +18 more
Fulfilling the goals of space-based exoplanetary transit surveys, like Kepler and TESS, is impossible without ground-based spectroscopic follow-up. In particular, the first-step vetting of candidates could easily necessitate several hundreds of hours of telescope time - an area where 2 m class telescopes can play a crucial role. Here, we describe …
The AMBRE Project: Spectrum normalisation influence on Mg abundances in the metal-rich Galactic disc
Recio-Blanco, A.; de Laverny, P.; Ordenovic, C. +2 more
Context. The abundance of α-elements provides an important fossil signature in Galactic archaeology to trace the chemical evolution of the different disc populations. High-precision chemical abundances are crucial to improving our understanding of the chemodynamical properties present in the Galaxy. However, deriving precise abundance estimations …
Optical and X-ray discovery of the changing-look AGN IRAS 23226-3843 showing extremely broad and double-peaked Balmer profiles
Schartel, N.; Komossa, S.; Kollatschny, W. +6 more
Aims: We detected a very strong X-ray decline in the galaxy IRAS 23226-3843 within the XMM-Newton slew survey in 2017. Subsequently, we carried out multi-band follow-up studies to investigate this fading galaxy in more detail.
Methods: We took deep follow-up Swift, XMM-Newton, and NuSTAR observations in combination with optical SALT spec…
Discovery of a Young Stellar Snake with Two Dissolving Cores in the Solar Neighborhood
Tian, Hai-Jun
We report the discovery of a young (only 30-40 Myr) snake-like structure (dubbed a stellar snake) in the solar neighborhood from Gaia DR2. The average distance of this structure is about 310 pc from us. Both the length and width are over 200 pc, but the thickness is only about 80 pc. The snake has one tail and two dissolving cores, which can be cl…