The CARMENES search for exoplanets around M dwarfs-Guaranteed time observations Data Release 1 (2016-2020)

I Ribas, A Reiners, M Zechmeister… - Astronomy & …, 2023 - aanda.org
Context. The CARMENES instrument, installed at the 3.5 m telescope of the Calar Alto
Observatory in Almería, Spain, was conceived to deliver high-accuracy radial velocity (RV) …

A Neptune-mass exoplanet in close orbit around a very low-mass star challenges formation models

G Stefánsson, S Mahadevan, Y Miguel, P Robertson… - Science, 2023 - science.org
Theories of planet formation predict that low-mass stars should rarely host exoplanets with
masses exceeding that of Neptune. We used radial velocity observations to detect a …

The Initial Mass Function Based on the Full-sky 20 pc Census of∼ 3600 Stars and Brown Dwarfs

JD Kirkpatrick, F Marocco, CR Gelino… - The Astrophysical …, 2024 - iopscience.iop.org
A complete accounting of nearby objects—from the highest-mass white dwarf progenitors
down to low-mass brown dwarfs—is now possible, thanks to an almost complete set of …

Mid-to-late M Dwarfs Lack Jupiter Analogs

EK Pass, JG Winters, D Charbonneau… - The Astronomical …, 2023 - iopscience.iop.org
Cold Jovian planets play an important role in sculpting the dynamical environment in which
inner terrestrial planets form. The core accretion model predicts that giant planets cannot …

The CARMENES search for exoplanets around M dwarfs-Stable radial-velocity variations at the rotation period of AD Leonis: A test case study of current limitations to …

D Kossakowski, M Kürster, T Henning… - Astronomy & …, 2022 - aanda.org
Context. A challenge with radial-velocity (RV) data is disentangling the origin of signals
either due to a planetary companion or to stellar activity. In fact, the existence of a planetary …

TOI-5205b: A Short-period Jovian Planet Transiting a Mid-M Dwarf

S Kanodia, S Mahadevan, J Libby-Roberts… - The Astronomical …, 2023 - iopscience.iop.org
We present the discovery of TOI-5205b, a transiting Jovian planet orbiting a solar metallicity
M4V star, which was discovered using Transiting Exoplanet Survey Satellite photometry and …

Forming giant planets around late-M dwarfs: Pebble accretion and planet–planet collision

M Pan, B Liu, A Johansen, M Ogihara, S Wang… - Astronomy & …, 2024 - aanda.org
We propose a pebble-driven core accretion scenario to explain the formation of giant
planets around the late-M dwarfs of M★= 0.1–0.2 M⊙. In order to explore the optimal disk …

TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley

P Chaturvedi, P Bluhm, E Nagel, AP Hatzes… - Astronomy & …, 2022 - aanda.org
We report the discovery and characterization of two small transiting planets orbiting the
bright M3. 0V star TOI-1468 (LSPM J0106+ 1913), whose transit signals were detected in …

GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth

E Palle, J Orell-Miquel, M Brady, J Bean… - Astronomy & …, 2023 - aanda.org
One of the main scientific goals of the TESS mission is the discovery of transiting small
planets around the closest and brightest stars in the sky. Here, using data from the …

CARMENES input catalog of M dwarfs-VII. New rotation periods for the survey stars and their correlations with stellar activity

Y Shan, D Revilla, SL Skrzypinski, S Dreizler… - Astronomy & …, 2024 - aanda.org
Aims. Knowledge of rotation periods (P rot) is important for understanding the magnetic
activity and angular momentum evolution of late-type stars, as well as for evaluating radial …