Search Publications
GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation
Bouchy, F.; Helled, R.; Mao, S. +37 more
We report the detection of GJ 3090 b (TOI-177.01), a mini-Neptune on a 2.9-day orbit transiting a bright (K = 7.3 mag) M2 dwarf located at 22 pc. The planet was identified by the Transiting Exoplanet Survey Satellite and was confirmed with the High Accuracy Radial velocity Planet Searcher radial velocities. Seeing-limited photometry and speckle im…
Global dynamics and architecture of the Kepler-444 system
Delisle, J. -B.; Udry, S.; Bourrier, V. +3 more
Context. S-type planets, which orbit one component of multiple-star systems, place strong constraints on planet formation and evolution models. A notable case study is Kepler-444, a triple-star system whose primary is orbited by five planets smaller than Venus in a compact configuration, and for which the stellar binary companion revolves around t…
Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet
Alonso, R.; Deleuil, M.; Erikson, A. +87 more
Context. The HD 108236 system was first announced with the detection of four small planets based on TESS data. Shortly after, the transit of an additional planet with a period of 29.54 d was serendipitously detected by CHEOPS. In this way, HD 108236 (V = 9.2) became one of the brightest stars known to host five small transiting planets (Rp
XMM-Newton and SRG/eROSITA observations of the isolated neutron star candidate 4XMM J022141.5−735632
Haberl, F.; Moustakas, J.; Salvato, M. +11 more
We report the results of follow-up investigations of a possible new thermally emitting isolated neutron star (INS),
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…