F. Kerschbaum
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View article: The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data
The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data Open
Context . Early theoretical works suggested that ultrahot Jupiters have inverted temperature-pressure (T–P) profiles in the presence of optical absorbers, such as TiO and VO. Recently, an inverted T–P profile of KELT-7b was detected, in ag…
View article: The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data
The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data Open
Ultrahot Jupiters are predicted to show inverted temperature-pressure (T-P) profiles in the presence of optical absorbers such as TiO and VO. An inverted T-P profile of KELT-7b was recently detected, in line with these predictions, but suc…
View article: The salty emission of the intermediate-mass AGB star OH 30.1−0.7
The salty emission of the intermediate-mass AGB star OH 30.1−0.7 Open
We analyse continuum and molecular emission, observed with Atacama Large Millimetre/submillimetre Array, from the dust-enshrouded intermediate-mass asymptotic giant branch (AGB) star OH 30.1−0.7. We find a secondary peak in the continuum m…
View article: The salty emission of the intermediate-mass AGB star OH 30.1 -0.7
The salty emission of the intermediate-mass AGB star OH 30.1 -0.7 Open
We analyse continuum and molecular emission, observed with ALMA, from the dust-enshrouded intermediate-mass AGB star OH 30.1 -0.7. We find a secondary peak in the continuum maps, "feature B", separated by 4.6" from the AGB star, which corr…
View article: The K2-24 planetary system revisited by CHEOPS
The K2-24 planetary system revisited by CHEOPS Open
The planetary system K2-24 is composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large transit time variations (TTVs), and it is an excellent laboratory to search for signatures of plane…
View article: The K2-24 planetary system revisited by CHEOPS
The K2-24 planetary system revisited by CHEOPS Open
K2-24 is a planetary system composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large TTVs, i.e., an excellent laboratory to search for signatures of planetary migration. Previous studies…
View article: Guiding and Target Acquisition for the Ariel Space Mission: Algorithms and Performance
Guiding and Target Acquisition for the Ariel Space Mission: Algorithms and Performance Open
Nothing in space is ever truly stable. For space telescopes such as Ariel, this leads to a noise source in photometric and spectroscopic measurements caused by the movement of the target star or spectra (also refereed to as jitter) across …
View article: Probing the dynamical and kinematical structures of detached shells around AGB stars
Probing the dynamical and kinematical structures of detached shells around AGB stars Open
Context. The chemical evolution of asymptotic giant branch (AGB) stars is driven by repeated thermal pulses (TPs). The duration of a TP is only a few hundred years, whereas an inter-pulse period lasts 10 4 − 10 5 yr. Direct observations of…
View article: The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with <i>CHEOPS</i>
The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with <i>CHEOPS</i> Open
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ‘radius inflation’ problem could have an impact on both stellar and exopla…
View article: The EBLM Project XI. Mass, radius and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS
The EBLM Project XI. Mass, radius and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS Open
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ``radius inflation'' problem could have an impact on both stellar and exop…
View article: Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX
Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX Open
Aims. Our goal is to study the long-term mass-loss rate characteristics of asymptotic giant branch (AGB) stars through wind-wind and wind-interstellar medium interaction. Methods. Far-ultraviolet (FUV) images from the GALEX survey are used…
View article: Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX
Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX Open
Aims. Our goal is to study the long-term mass-loss rate characteristics of asymptotic giant branch (AGB) stars through wind-wind and wind-interstellar medium interaction. Methods. Far-ultraviolet (FUV) images from the Galex survey are used…
View article: Herschel and the infrared
Herschel and the infrared Open
THE HERSCHEL’S EXPERIMENT AND THE INFRARED
View article: Cross-matching the General Catalogue of Variable Stars with the <i>Gaia</i> DR3 source catalogue
Cross-matching the General Catalogue of Variable Stars with the <i>Gaia</i> DR3 source catalogue Open
The most recent release of the General Catalogue of Variable Stars (GCVS) (Samus et al. 2017) contains 518 different variable types, in eight different variable categories. The catalogue has now reached its 5th version available via the Vi…
View article: TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS Open
Context. TOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have prov…
View article: DEATHSTAR: Nearby AGB stars with the Atacama Compact Array II. CO envelope sizes and asymmetries: The S-type stars
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array II. CO envelope sizes and asymmetries: The S-type stars Open
We aim to constrain the sizes of the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, respectively. We map the emission from the CO J=2-1 and 3-2 lines observed wit…
View article: DEATHSTAR: nearby AGB stars with the Atacama Compact Array
DEATHSTAR: nearby AGB stars with the Atacama Compact Array Open
Aims. We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, respectively. Me…
View article: Report on the Scientific Prioritisation Community Poll (2020)
Report on the Scientific Prioritisation Community Poll (2020) Open
ESO regularly updates its science- driven perspective in order to provide the best facilities and services for its community. As part of this exercise, ESO polled its users between January and February 2020. Questions were inspired by the …
View article: DEATHSTAR: Nearby AGB stars with the Atacama Compact Array I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates Open
This is the first publication of the DEATHSTAR project. The goal of the project is to reduce the uncertainties of observational estimates of mass-loss rates from Asymptotic Giant Branch (AGB) stars. Line emission from 12CO J=2-1 and 3-2 we…
View article: DEATHSTAR: Nearby AGB stars with the Atacama Compact Array
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array Open
Context. This is the first publication from the DEATHSTAR project. The overall goal of the project is to reduce the uncertainties of the observational estimates of mass-loss rates from evolved stars on the Asymptotic Giant Branch (AGB). Ai…
View article: The extended molecular envelope of the asymptotic giant branch star <i>π</i><sup>1</sup> Gruis as seen by ALMA
The extended molecular envelope of the asymptotic giant branch star <i>π</i><sup>1</sup> Gruis as seen by ALMA Open
Context. This study is a follow up to the previous analysis of lower-angular resolution data in which the kinematics and structure of the circumstellar envelope (CSE) around the S-type asymptotic giant branch (AGB) star π 1 Gruis were inve…
View article: The extended molecular envelope of the asymptotic giant branch star $π^{1}$ Gruis as seen by ALMA II. The spiral-outflow observed at high-angular resolution
The extended molecular envelope of the asymptotic giant branch star $π^{1}$ Gruis as seen by ALMA II. The spiral-outflow observed at high-angular resolution Open
The AGB star $π^{1}$ Gruis has a known companion (at a separation of ~400 AU) which cannot explain the strong deviations from the spherical symmetry of the CSE. Recently, hydrodynamic simulations of mass transfer in closer binary systems h…
View article: Cool, evolved stars: results, challenges, and promises for the next decade
Cool, evolved stars: results, challenges, and promises for the next decade Open
Cool, evolved stars are the main source of chemical enrichment of the interstellar medium (ISM), and understanding their mass loss and structure offers a unique opportunity to study the cycle of matter in the Universe. Pulsation, convectio…
View article: ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell
ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell Open
Aims. The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like …
View article: ALMA observations of the “fresh” carbon-rich AGB star TX Piscium
ALMA observations of the “fresh” carbon-rich AGB star TX Piscium Open
Aims. The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like …
View article: Constraining convection across the AGB with high-angular-resolution observations
Constraining convection across the AGB with high-angular-resolution observations Open
We present very detailed images of the photosphere of an AGB star obtained with the PIONIER instrument, installed at the Very Large Telescope Interferometer (VLTI). The images show a well defined stellar disc populated by a few convective …
View article: Molecular line study of the S-type AGB star W Aquilae
Molecular line study of the S-type AGB star W Aquilae Open
Context . With the outstanding spatial resolution and sensitivity of the Atacama Large Millimeter/sub-millimeter Array (ALMA), molecular gas other than the abundant CO can be observed and resolved in circumstellar envelopes (CSEs) around e…
View article: Molecular line study of the S-type AGB star W Aquilae. ALMA observations of CS, SiS, SiO and HCN
Molecular line study of the S-type AGB star W Aquilae. ALMA observations of CS, SiS, SiO and HCN Open
Context. With the outstanding spatial resolution and sensitivity of the Atacama Large Millimeter/sub-millimeter Array (ALMA), molecular gas other than the abundant CO can be observed and resolved in circumstellar envelopes (CSEs) around ev…