Search Publications
The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS2
Derekas, A.; Szigeti, L.; Souami, D. +60 more
Context. Stellar occultations have become one of the best techniques to gather information about the physical properties of trans-Neptunian objects (TNOs), which are critical objects for understanding the origin and evolution of our Solar System.
Aims: The purpose of this work is to determine, with better accuracy, the physical characteristic…
Comparison of machine learning algorithms used to classify the asteroids observed by all-sky surveys
Carry, B.; Penttilä, A.; Klimczak, H. +4 more
Context. Multifilter photometry from large sky surveys is commonly used to assign asteroid taxonomic types and study various problems in planetary science. To maximize the science output of those surveys, it is important to use methods that best link the spectro-photometric measurements to asteroid taxonomy.
Aims: We aim to determine which ma…
Observations of multiple NH3 transitions in W33
Immer, K.; Henkel, C.; Wilson, T. L. +10 more
At a distance of 2.4 kpc, W33 is an outstanding massive and luminous 10 pc-sized star forming complex containing quiescent infrared dark clouds as well as highly active infrared bright cloud cores heated by young massive stars. We report measurements of ammonia (NH3) inversion lines in the frequency range 18-26 GHz obtained with the 40"…
A search for transiting planets around hot subdwarfs. II. Supplementary methods and results from TESS Cycle 1
Van Grootel, V.; Charpinet, S.; Siess, L. +3 more
Context. Hot subdwarfs, which are hot and small He-burning objects, are ideal targets for exploring the evolution of planetary systems after the red giant branch (RGB). Thus far, no planets have been confirmed around them, and no systematic survey to find planets has been carried out.
Aims: In this project, we aim to perform a systematic tran…
Alleviating the transit timing variation bias in transit surveys. II. RIVERS: Twin resonant Earth-sized planets around Kepler-1972 recovered from a Kepler false positive
Eggenberger, P.; Delisle, J. -B.; Alibert, Y. +4 more
Transit timing variations (TTVs) can provide useful information for systems observed in this way, putting constraints on the masses and eccentricities of the observed planets, and in some cases even revealing the existence of non-transiting companions. However, TTVs can also prevent the detection of small planets in transit surveys, or bias the re…
A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs. Color validation of TOI-4479b and TOI-2081b
Tamura, M.; Pallé, E.; Korth, J. +45 more
Aims: We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b.
Methods: We jointly analyzed space (TESS mission) and ground-based (MuSCAT2, MuSCAT3 and SINISTRO instruments) light curves using our multicolor photometry transit analysis pipeline. This allowed us to compute contaminati…
Astrometric mass measurement of compact companions in binary systems with Gaia
Liu, Jifeng; Gao, Jian; Liao, Shilong +3 more
Context. For binary systems with an unseen primary and a luminous secondary, the astrometric wobble of the secondary could be used to study the primary. With Gaia, it is possible to measure the mass of the black hole or neutron star with a luminous companion (hereafter BH/NS-LC).
Aims: Our aim is to provide a method for predicting Gaia's abil…
He-star donor AM CVn stars and their progenitors as LISA sources
Yungelson, L.; Liu, W. -M.; Kuranov, A.
Context. Ultracompact cataclysmic variables (CVs) of the AM CVn type are deemed to be important verification sources for the future space gravitational wave detectors such as the Laser Interferometer Space Antenna (LISA).
Aims: We model the present-day Galactic population of AM CVn stars with He-star donors. Such a population has long expecte…
A first eROSITA view of ultracool dwarfs
Salvato, M.; Stelzer, B.; Coffaro, M. +2 more
We present the first X-ray detections of ultracool dwarfs (UCDs) from the first all-sky survey of the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) onboard the Russian Spektrum-Roentgen-Gamma mission. We use three publicly available input catalogs of spectroscopically confirmed UCDs and Gaia-selected UCD candidates that togeth…
Emission line star catalogues post-Gaia DR3. A validation of Gaia DR3 data using the LAMOST OBA emission catalogue
Arun, R.; Manoj, P.; Paul, K. T. +9 more
Aims.Gaia Data Release 3 (DR3) and further releases have the potential to identify and categorise new emission-line stars in the Galaxy. We perform a comprehensive validation of astrophysical parameters from Gaia DR3 with the spectroscopically estimated emission-line star parameters from the LAMOST OBA emission catalogue. Method. We compare differ…