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Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops
Guterman, P.; Alonso, R.; Deleuil, M. +126 more
HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP 9618 b) and 3.343 ± 0.039 R⊕ (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two tr…
TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906
Alonso, R.; Deleuil, M.; Erikson, A. +119 more
We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer pla…
The EBLM project - IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves
Alonso, R.; Deleuil, M.; Erikson, A. +85 more
Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars' masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host st…
Discovery of TOI-1260d and the characterization of the multiplanet system
Guterman, P.; Alonso, R.; Deleuil, M. +84 more
We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angula…
CHEOPS's hunt for exocomets: photometric observations of 5 Vul
Lecavelier Des Etangs, Alain; Zieba, Sebastian; Rebollido, Isabel +3 more
The presence of minor bodies in exoplanetary systems is in most cases inferred through infrared excesses, with the exception of exocomets. Even if over 35 yr have passed since the first detection of exocomets around β Pic, only ~25 systems are known to show evidence of evaporating bodies, and most of them have only been observed in spectroscopy. W…