M. R. Zapatero Osorio
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View article: Stellar-activity analysis of the nearby M dwarf GJ 526
Stellar-activity analysis of the nearby M dwarf GJ 526 Open
M dwarfs are the most abundant stars in the Galaxy, and their low masses make them natural favourites for exoplanet radial-velocity (RV) searches. Nevertheless, these stars often demonstrate strong stellar activity that is yet to be fully …
View article: TOI-283 b: A transiting mini-Neptune in a 17.6-day orbit discovered with TESS and ESPRESSO
TOI-283 b: A transiting mini-Neptune in a 17.6-day orbit discovered with TESS and ESPRESSO Open
Context . Super-Earths and mini-Neptunes are missing from our Solar System, yet they appear to be the most abundant planetary types in our Galaxy. A detailed characterization of key planets within this population is important for understan…
View article: HAWC Performance Enhanced by Machine Learning in Gamma-hadron Separation
HAWC Performance Enhanced by Machine Learning in Gamma-hadron Separation Open
Improving gamma-hadron separation is one of the most effective ways to enhance the performance of ground-based gamma-ray observatories. With more than a decade of continuous operation, the High-Altitude Water Cherenkov (HAWC) Observatory h…
View article: Assessing social and energy vulnerabilities through a novel S-LCA approach: A rural case study in Colombia’s Pacific region
Assessing social and energy vulnerabilities through a novel S-LCA approach: A rural case study in Colombia’s Pacific region Open
Purpose This study applies a novel adaptation of Social Life Cycle Assessment (S-LCA) at the community level, focusing on household-based dynamics rather than conventional product or service systems, to identify social hotspots in a Pacifi…
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: 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: TOI-2322: Two transiting rocky planets close to the stellar rotation period and its first harmonic
TOI-2322: Two transiting rocky planets close to the stellar rotation period and its first harmonic Open
Context . Active regions on the stellar surface can induce quasi-periodic radial velocity (RV) variations that can mimic planets and mask true planetary signals. These spurious signals can be problematic for RV surveys such as those carrie…
View article: ATREIDES
ATREIDES Open
The distribution of close-in exoplanets is shaped by a complex interplay between atmospheric and dynamical processes. The Desert, Ridge, and Savanna (respectively a lack, overoccurence, and mild deficit of Neptunes with increasing periods)…
View article: Silicate precursor silane detected in cold low-metallicity brown dwarf
Silicate precursor silane detected in cold low-metallicity brown dwarf Open
Within 20 pc of the Sun, there are currently 29 known cold brown dwarfs-sources with measured distances and an estimated effective temperature between that of Jupiter (170 K) and approximately 500 K (ref. 1). These sources are almost all i…
View article: <i>Euclid</i>: the potential of slitless infrared spectroscopy: a <i>z</i> = 5.4 quasar and new ultracool dwarfs
<i>Euclid</i>: the potential of slitless infrared spectroscopy: a <i>z</i> = 5.4 quasar and new ultracool dwarfs Open
We demonstrate the potential of Euclid ’s slitless spectroscopy to discover high-redshift ($z>5$) quasars and their main photometric contaminant, ultracool dwarfs. Sensitive infrared spectroscopy from space is able to efficiently identi…
View article: A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level
A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level Open
Aims . We analyse ESPRESSO data for the stars HD 10700 ( τ Ceti), HD 20794 ( e Eridani), HD 102365, and HD 304636 acquired via its Guaranteed Time Observations (GTO) programme. We characterise the stars’ radial velocity (RV) signals down t…
View article: A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level
A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level Open
We analyse ESPRESSO data for the stars HD10700, HD20794, HD102365, and HD304636 acquired via its Guaranteed Time Observations (GTO) programme. We characterise the stars' radial velocity (RV) signals down to a precision of 10 cm/s on timesc…
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 ESPRESSO transmission spectrum of HD189733 b
The ESPRESSO transmission spectrum of HD189733 b Open
Context . While transmission spectroscopy has allowed us to detect many atomic and molecular species in exoplanet atmospheres, the improvement in resolution and signal-to-noise ratio (S/N) enabled us to become sensitive to planet-occulted …
View article: Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna
Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna Open
Context . The formation and evolution of ultra-short-period (USP) rocky planets is poorly understood. However, it is widely thought that these planets could not have formed at their present-day close-in orbits, but instead migrated inwards…
View article: The ESPRESSO Redshift Drift Experiment
The ESPRESSO Redshift Drift Experiment Open
Context. The measurement of the tiny temporal evolution in the redshift of distant objects, the redshift drift, is a powerful probe of universal expansion and cosmology. Aims. We performed the first steps towards the measurement of such an…
View article: A transiting rocky super-Earth and a non-transiting sub-Neptune orbiting the M dwarf TOI-771
A transiting rocky super-Earth and a non-transiting sub-Neptune orbiting the M dwarf TOI-771 Open
Context. The origin and evolution of the sub-Neptune population is a highly debated topic in the exoplanet community. With the advent of JWST , atmospheric studies can now put unprecedented constraints on the internal composition of this p…
View article: Ground-breaking exoplanet science with the ANDES spectrograph at the ELT
Ground-breaking exoplanet science with the ANDES spectrograph at the ELT Open
In the past decade the study of exoplanet atmospheres at high-spectral resolution, via transmission/emission spectroscopy and cross-correlation techniques for atomic/molecular mapping, has become a powerful and consolidated methodology. Th…
View article: Detection of Methane in the Closest Extreme Metal-poor T Dwarf WISEA J181006.18−101000.5*
Detection of Methane in the Closest Extreme Metal-poor T Dwarf WISEA J181006.18−101000.5* Open
WISEA J181006.18−101000.5 (WISE1810) is the nearest metal-poor ultracool dwarf to the Sun. It has a low effective temperature and has been classified as an extreme early-T subdwarf. However, methane, the characteristic molecule of the spec…
View article: Optical constraints on the coldest metal-poor population
Optical constraints on the coldest metal-poor population Open
Context. The coldest metal-poor population made up of T and Y dwarfs can serve as an archaeological tracer of our Galaxy because these very old objects have retained their pristine material. The optical properties of these objects are impo…
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: Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North
Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North Open
Ultracool dwarfs (UCDs) encompass the lowest mass stars and brown dwarfs, defining the stellar substellar boundary. They have significant potential for advancing the understanding of substellar physics; however, these objects are challengi…
View article: Detection of Methane in the Closest Extreme Metal-poor T Dwarf WISEA J181006.18-101000.5
Detection of Methane in the Closest Extreme Metal-poor T Dwarf WISEA J181006.18-101000.5 Open
WISEA J181006.18-101000.5 (WISE1810) is the nearest metal-poor ultracool dwarf to the Sun. It has a low effective temperature and has been classified as extreme early-T subdwarf. However, methane, the characteristic molecule of the spectra…
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-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO
TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO Open
Context. One of the goals of the ESPRESSO guaranteed time observations (GTOs) at the ESO 8.2 m telescope is to follow up on candidate planets from transit surveys such as the TESS mission. High-precision radial velocities are required to c…
View article: TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO
TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO Open
One of the goals of the ESPRESSO guaranteed time observations (GTOs) at the ESO 8.2m telescope is to follow up on candidate planets from transit surveys such as the TESS mission. High-precision radial velocities are required to characteriz…
View article: Study of Long-term Spectral Evolution and X-Ray and <i>γ</i>-Ray Correlation of Blazars Seen by HAWC
Study of Long-term Spectral Evolution and X-Ray and <i>γ</i>-Ray Correlation of Blazars Seen by HAWC Open
The HAWC Observatory collected 6 yr of extensive data, providing an ideal platform for long-term monitoring of blazars in the very high energy (VHE) band, without bias toward specific flux states. HAWC continuously monitors blazar activity…
View article: Titanium chemistry of WASP-121 b with ESPRESSO in 4-UT mode
Titanium chemistry of WASP-121 b with ESPRESSO in 4-UT mode Open
Transit spectroscopy usually relies on the integration of one or several transits to achieve the signal-to-noise ratio (S/N) necessary to resolve spectral features. Consequently, high-S/N observations of exoplanet atmospheres, where we can…