Search Publications
A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS
Bouchy, F.; Stassun, K.; Winn, J. N. +49 more
The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant planet in an 11.54-day eccentric orbit around a bright (V = 7.9) G-type subgiant. We estimate both host star and planetary parameters consistently using EXOFASTv2 based on …
Chemical and kinematic structure of extremely high-velocity molecular jets in the Serpens Main star-forming region
Hull, Charles L. H.; Le Gouellec, Valentin J. M.; van Dishoeck, Ewine F. +3 more
Context. Outflows are one of the first signposts of ongoing star formation. The fastest molecular component of protostellar outflows, extremely high-velocity (EHV) molecular jets, are still puzzling since they are seen only rarely. As they originate deep inside the embedded protostar-disk system, they provide vital information about the outflow-la…
The SOPHIE search for northern extrasolar planets. XIV. A temperate (Teq 300 K) super-earth around the nearby star Gliese 411
Bouchy, F.; Deleuil, M.; Moutou, C. +33 more
Periodic radial velocity variations in the nearby M-dwarf star Gl 411 are reported, based on measurements with the SOPHIE spectrograph. Current data do not allow us to distinguish between a 12.95-day period and its one-day alias at 1.08 days, but favour the former slightly. The velocity variation has an amplitude of 1.6 m s-1, making th…
Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b
Queloz, D.; Quanz, S. P.; Avenhaus, H. +38 more
HIP 65426 b is a recently discovered exoplanet imaged during the course of the SPHERE-SHINE survey. Here we present new L' and M' observations of the planet from the NACO instrument at the VLT from the NACO-ISPY survey, as well as a new Y -H spectrum and K-band photometry from SPHERE-SHINE. Using these data, we confirm the nature of the companion …
Upper limits on CH3OH in the HD 163296 protoplanetary disk. Evidence for a low gas-phase CH3OH-to-H2CO ratio
Carpenter, J. M.; Walsh, C.; Hogerheijde, M. R. +6 more
Context. Methanol (CH3OH) is at the root of organic ice chemistry in protoplanetary disks. Its connection to prebiotic chemistry and its role in the chemical environment of the disk midplane make it an important target for disk chemistry studies. However, its weak emission has made detections difficult. To date, gas-phase CH3…
HD 2685 b: a hot Jupiter orbiting an early F-type star detected by TESS
Henning, Thomas; Vanderburg, Andrew; Latham, David W. +50 more
We report on the confirmation of a transiting giant planet around the relatively hot (Teff = 6801 ± 76 K) star HD 2685, whose transit signal was detected in Sector 1 data of NASA's TESS mission. We confirmed the planetary nature of the transit signal using Doppler velocimetric measurements with CHIRON, CORALIE, and FEROS, as well as usi…
Carbon-rich (DQ) white dwarfs in the Sloan Digital Sky Survey
Kepler, S. O.; Koester, D.
Context. Among the spectroscopically identified white dwarfs, a fraction smaller than 2% have spectra dominated by carbon lines, mainly molecular C2, but also a smaller group dominated by C I and C II lines. These are together called DQ white dwarfs.
Aims: We want to derive atmospheric parameters Teff, log g, and carbon …
Carbon depletion observed inside T Tauri inner rims. Formation of icy, kilometer size planetesimals by 1 Myr
McClure, M. K.
Context. The carbon content of protoplanetary disks is an important parameter to characterize planets formed at different disk radii. There is some evidence from far-infrared and submillimeter observations that gas in the outer disk is depleted in carbon, with a corresponding enhancement of carbon-rich ices at the disk midplane. Observations of th…
Three-dimensional modeling of chromospheric spectral lines in a simulated active region
Cheung, Mark C. M.; Rempel, Matthias; Danilovic, Sanja +4 more
Context. Because of the complex physics that governs the formation of chromospheric lines, interpretation of solar chromospheric observations is difficult. The origin and characteristics of many chromospheric features are, because of this, unresolved.
Aims: We focus on studying two prominent features: long fibrils and flare ribbons. To model …
The EREBOS project: Investigating the effect of substellar and low-mass stellar companions on late stellar evolution. Survey, target selection, and atmospheric parameters
Geier, S.; Dreizler, S.; Heber, U. +14 more
Eclipsing post-common-envelope binaries are highly important for resolving the poorly understood, very short-lived common-envelope phase of stellar evolution. Most hot subdwarfs (sdO/Bs) are the bare helium-burning cores of red giants that have lost almost all of their hydrogen envelope. This mass loss is often triggered by common-envelope interac…