P. J. Amado
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View article: TOI-7166 b: a habitable zone mini-Neptune planet around a nearby low-mass star
TOI-7166 b: a habitable zone mini-Neptune planet around a nearby low-mass star Open
We present the discovery and validation of TOI-7166 b, a $2.01 \pm 0.05\,\mathrm{ R}_{\oplus }$ planet orbiting a nearby low-mass star. We validated the planet by combining Transiting Exoplanet Survey Satellite and multicolour high-precisi…
View article: The mass of the exo-Venus Gliese 12 b, as revealed by HARPS-N, ESPRESSO, and CARMENES
The mass of the exo-Venus Gliese 12 b, as revealed by HARPS-N, ESPRESSO, and CARMENES Open
Small temperate planets are prime targets for exoplanet studies due to their possible similarities with the rocky planets in the Solar system. M dwarfs are promising hosts since the planetary signals are within our current detection capabi…
View article: A planetary system with a sub-Neptune planet in the habitable zone of TOI-2093
A planetary system with a sub-Neptune planet in the habitable zone of TOI-2093 Open
Aims . We aim to confirm and measure the mass of the transiting planet candidate around the K5 V star TOI-2093, previously announced by the Transiting Exoplanet Survey Satellite (TESS) project. Methods . We combined photometric data from 3…
View article: Improving radial velocity precision with CARMENES-PLUS:An upgrade of the near-infrared spectrograph cooling system
Improving radial velocity precision with CARMENES-PLUS:An upgrade of the near-infrared spectrograph cooling system Open
CARMENES is a dual-channel high-resolution spectrograph at the 3.5 m Calar Alto telescope designed to detect low-mass planets around late-type dwarfs by measuring their radial velocities (RVs). High thermal stability in both the visible (V…
View article: A detailed analysis of the Gl 486 planetary system
A detailed analysis of the Gl 486 planetary system Open
Context . The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5 V star at just 8 pc with a warm transiting rocky planet of about 1.3 R ⊕ and 3.0 M ⊕ . It is ideal for both transmission and emission spectroscopy…
View article: Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267
Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267 Open
We report the discovery of two warm exoplanets orbiting the cool binary system TOI-2267, composed of the M5 (TOI-2267A) and M6 (TOI-2267B) stars, whose angular separation is 0.384 arcsec, corresponding to a projected distance of only about…
View article: Improving radial velocity precision with CARMENES-PLUS
Improving radial velocity precision with CARMENES-PLUS Open
Context: CARMENES is a dual-channel high-resolution spectrograph at the 3.5 m Calar Alto telescope designed to detect low-mass planets around late-type dwarfs by measuring their radial velocities (RVs). High thermal stability in both the v…
View article: Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267
Two warm Earth-sized exoplanets and an Earth-sized candidate in the M5V-M6V binary system TOI-2267 Open
We report two warm Earth-sized exoplanets orbiting the close binary TOI-2267 (M5+M6, separation ~8 au). Data from TESS and ground-based facilities confirm the planets, but we cannot determine which star they orbit. The planets have radii o…
View article: The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 317, GJ 463, and GJ 3512 systems and two newly discovered planets orbiting GJ 9773 and GJ 508.2
The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 317, GJ 463, and GJ 3512 systems and two newly discovered planets orbiting GJ 9773 and GJ 508.2 Open
Surveys for exoplanets indicate that the occurrence rate of gas giant planets orbiting late-type stars in orbits with periods shorter than 1000 days is lower than in the case of Sun-like stars. This is in agreement with planet formation mo…
View article: The CARMENES search for exoplanets around M dwarfs
The CARMENES search for exoplanets around M dwarfs Open
Context . Surveys for exoplanets indicate that the occurrence rate of gas giant planets orbiting late-type stars in orbits with periods shorter than 1000 days is lower than in the case of Sun-like stars. This is in agreement with planet fo…
View article: MARCOT: Modular Astronomy in the Post-ELT Era through Photonic Integration
MARCOT: Modular Astronomy in the Post-ELT Era through Photonic Integration Open
The Multi ARray of COmbined Telescopes (MARCOT) is a novel astronomical facility concept developed to meet the increasing demand for scalable, cost-effective, and modular telescope architectures. This project is structured in multiple phas…
View article: Hunting exoplanets around ultracool dwarfs with near-infrared radial velocity spectrographs
Hunting exoplanets around ultracool dwarfs with near-infrared radial velocity spectrographs Open
The ultracool dwarf stars are frequent in the solar neighborhood, but so far only four systems with exoplanets have been confirmed, TRAPPIST-1, SPECULOOS-2 and 3, and Teegarden’s star. There are several reasons for the low number of detect…
View article: Planet-induced Modulation of Stellar Activity in an M-Dwarf: Insights into the Magnetism of a Benchmark Warm Neptune
Planet-induced Modulation of Stellar Activity in an M-Dwarf: Insights into the Magnetism of a Benchmark Warm Neptune Open
Interactions between stellar and planetary magnetic fields are expected to produce observable radio and optical signals modulated by their orbital periods, but direct detections remain elusive. Here, we analyze 17 years of spectroscopic da…
View article: The mass of the exo-Venus Gliese 12 b, as revealed by HARPS-N, ESPRESSO, and CARMENES
The mass of the exo-Venus Gliese 12 b, as revealed by HARPS-N, ESPRESSO, and CARMENES Open
Small temperate planets are prime targets for exoplanet studies due to their possible similarities with the rocky planets in the Solar System. M dwarfs are promising hosts since the planetary signals are within our current detection capabi…
View article: Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b
Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b Open
The ultra-hot Jupiter (UHJ) TOI-2109b marks the lower edge of the equilibrium temperature gap between 3500 and 4500 K, an unexplored thermal regime that separates KELT-9b, the hottest planet yet discovered, from all other currently known g…
View article: The CARMENES search for exoplanets around M dwarfs. Cluster analysis of signals from spectral activity indicators to search for shared periods
The CARMENES search for exoplanets around M dwarfs. Cluster analysis of signals from spectral activity indicators to search for shared periods Open
A multitude of spectral activity indicators are routinely computed nowadays from the spectra generated as part of planet-hunting radial velocity surveys. Searching for shared periods among them can help to robustly identify astrophysical q…
View article: The CARMENES search for exoplanets around M dwarfs
The CARMENES search for exoplanets around M dwarfs Open
Context. A multitude of spectral activity indicators are routinely computed nowadays from the spectra generated as part of planet-hunting radial velocity surveys. Searching for shared periods among them can help to robustly identify astrop…
View article: The CARMENES search for exoplanets around M dwarfs
The CARMENES search for exoplanets around M dwarfs Open
Context. Current exoplanet surveys are focused on detecting small exoplanets orbiting in the liquid-water habitable zones of their host stars. Despite recent significant advancements in instrumentation, the main limitation in detecting the…
View article: The CARMENES search for exoplanets around M dwarfs
The CARMENES search for exoplanets around M dwarfs Open
Aims. Previous estimates of planet occurrence rates in the CARMENES survey indicated increased numbers of planets on short orbits for M dwarfs with masses below 0.34M ⊙ . Here we focused on the lowest-mass stars in the survey, comprising 1…
View article: TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet
TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet Open
TOI-2015 is a known exoplanetary system around an M4 dwarf star, consisting of a transiting sub-Neptune planet in a 3.35-day orbital period, TOI-2015 b, accompanied by a non-transiting companion, TOI-2015 c. High-precision radial-velocity …
View article: TOI-2015b: a sub-Neptune in strong gravitational interaction with an outer non-transiting planet
TOI-2015b: a sub-Neptune in strong gravitational interaction with an outer non-transiting planet Open
TOI-2015 is a known exoplanetary system around an M4 dwarf star, consisting of a transiting sub-Neptune planet in a 3.35-day orbital period, TOI-2015b, accompanied by a non-transiting companion, TOI-2015c. High-precision RV measurements we…
View article: Connection between planetary He I λ10 830 Å absorption and extreme-ultraviolet emission of planet-host stars
Connection between planetary He I λ10 830 Å absorption and extreme-ultraviolet emission of planet-host stars Open
Context . The detection of the He I λ10 830 Å triplet in exoplanet atmospheres has opened a new window for probing planetary properties, including atmospheric escape. Unlike Lyman α, the triplet is significantly less affected by interstell…
View article: Searching for star-planet interactions in GJ 486 at radio wavelengths with the uGMRT
Searching for star-planet interactions in GJ 486 at radio wavelengths with the uGMRT Open
Aims. We search for radio emission from star–planet interactions in the M dwarf system GJ 486, which hosts an Earth-like planet. Methods. We observed the GJ 486 system with the upgraded Giant Metrewave Radio Telescope (uGMRT) from 550 to 7…
View article: CARMENES input catalogue of M dwarfs IX. Multiplicity from close spectroscopic binaries to ultra-wide systems
CARMENES input catalogue of M dwarfs IX. Multiplicity from close spectroscopic binaries to ultra-wide systems Open
Multiplicity studies greatly benefit from focusing on M dwarfs because they are often paired in a variety of configurations with both stellar and substellar objects, including exoplanets. We aim to address the observed multiplicity of M dw…
View article: CARMENES input catalogue of M dwarfs
CARMENES input catalogue of M dwarfs Open
Context . Multiplicity studies greatly benefit from focusing on M dwarfs because they are often paired in a variety of configurations with both stellar and substellar objects, including exoplanets. Aims . We aim to address the observed mul…
View article: The CARMENES search for exoplanets around M dwarfs
The CARMENES search for exoplanets around M dwarfs Open
Context. Radial velocity (RV) jitter represents an intrinsic limitation on the precision of Doppler searches for exoplanets that can originate from both instrumental and astrophysical sources. Aims. We aim to determine the RV jitter floor …
View article: Searching for star-planet interactions in GJ 486 at radio wavelengths with the uGMRT
Searching for star-planet interactions in GJ 486 at radio wavelengths with the uGMRT Open
We search for radio emission from star-planet interactions in the M-dwarf system GJ~486, which hosts an Earth-like planet. We observed the GJ~486 system with the upgraded Giant Metrewave Radio Telescope (uGMRT) from 550 to 750 MHz in nine …
View article: CARMENES input catalogue of M dwarfs VIII. Kinematics in the solar neighbourhood
CARMENES input catalogue of M dwarfs VIII. Kinematics in the solar neighbourhood Open
Aims. Our goals are to characterise the kinematic properties and to identify young and old stars among the M dwarfs of the CARMENES input catalogue. Methods. We compiled the spectral types, proper motions, distances, and radial velocities …