M. Sánchez-Benavente
A5081540018- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
Universidad de La Laguna
2020-2024
Instituto de Astrofísica de Canarias
2020-2024
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres terrestrial via follow-up spectroscopic observations. However, number such receiving low insolation is still small, limiting our ability understand diversity atmospheric composition and climates temperate planets. We report discovery an planet (12 pc) inactive M3.0 dwarf Gliese 12 (TOI-6251) with orbital period ($P_{\rm{orb}}$) 12.76 days. The planet, 12b, was initially...
We performed a detailed spectroscopic analysis of three extremely metal-poor RR Lyrae stars, exploring uncharted territories at these low metallicities for this class stars. Using high-resolution spectra acquired with HARPS-N TNG, UVES VLT, and PEPSI LBT, employing Non-Local Thermodynamic Equilibrium (NLTE) spectral synthesis calculations, we provide abundance measurements Fe, Al, Mg, Ca, Ti, Mn, Sr. Our findings indicate that the stars have Fe/H = -3.40 ± 0.05, -3.28 0.02, -2.77 0.05 HD...
We performed a detailed spectroscopic analysis of three extremely metal-poor RR Lyrae stars, exploring uncharted territories at these low metallicities for this class stars. Using high-resolution spectra acquired with HARPS-N TNG, UVES VLT, and PEPSI LBT, employing Non-Local Thermodynamic Equilibrium (NLTE) spectral synthesis calculations, we provide abundance measurements Fe, Al, Mg, Ca, Ti, Mn, Sr. Our findings indicate that the stars have [Fe/H] = -3.40 \pm 0.05, -3.28 0.02, -2.77 0.05 HD...
TOI-2015 is a known exoplanetary system around an M4 dwarf star, consisting of transiting sub-Neptune planet in 3.35-day orbital period, TOI-2015b, accompanied by non-transiting companion, TOI-2015c. High-precision RV measurements were taken with the MAROON-X spectrograph, and high-precision photometric data collected several networks. We re-characterize target star combining optical spectr, Bayesian Model Averaging (BMA) Spectral Energy Distribution (SED) analysis. The host K=10.3mag...
TOI-2015 is a known exoplanetary system around an M4 dwarf star, consisting of transiting sub-Neptune planet in 3.35-day orbital period, TOI-2015,b, accompanied by non-transiting companion, TOI-2015,c. High-precision radial-velocity measurements were taken with the spectrograph, and high-precision photometric data collected, primarily using SPECULOOS, MUSCAT, TRAPPIST LCOGT networks. We collected 63 transit light curves 49 different epochs for TOI-2015,b. re-characterized target star...
Context. Exoplanets with orbital periods of less than one day are known as ultra-short period (USP) planets. They relatively rare products planetary formation and evolution processes, but especially favourable for characterisation current planet detection methods. At the time writing, 125 USP planets have already been confirmed. Aims. Our aim is to validate nature two new transiting candidates around M dwarfs announced by NASA Transiting Exoplanet Survey Satellite (TESS), registered TESS...
Abstract This paper investigates the hierarchy of baryon physics assembly bias relations obtained from state-of-the-art hydrodynamic simulations with respect to underlying cosmic web spanned by dark matter field. Using Bias Assignment Method we find that nonlocal plays a central role. We classify based on invariants curvature tensor defined not only gravitational potential, but especially overdensity, as small-scale clustering becomes important in this context. First, gas density relation...
We present the optical transmission spectrum of hot Jupiter WASP-104b based on one transit observed by blue and red channels DBSP spectrograph at Palomar 200-inch telescope 14 transits MuSCAT2 four-channel imager 1.52 m Telescopio Carlos Sanchez. also analyse 45 additional K2 transits, after correcting for flux contamination from a companion star. Together with light curves acquired MuSCAT2, we are able to revise system parameters orbital ephemeris, confirming that no timing variations...
We present new transit observations of the hot Jupiter WASP-74 b ($T_\mathrm{eq} \sim$ 1860 K) using high-resolution spectrograph HARPS-N and multi-colour simultaneous imager MuSCAT2. refine orbital properties planet its host star, measure obliquity for first time. The measured sky-projected angle between stellar spin-axis planet's axis is compatible with an orbit well-aligned equator star ($\lambda = 0.77\pm0.99 \mathrm{deg}$). are not able to detect any absorption feature H$\alpha$, or...
Abstract This work presents a new physically motivated supervised machine-learning method, hydro-bam , to reproduce the three-dimensional Ly α forest field in real and redshift space, which learns from reference hydrodynamic simulation thereby saves about seven orders of magnitude computing time. We show that our method is accurate up k ∼ 1 h Mpc −1 one- (probability distribution function), two- (power spectra), three-point (bispectra) statistics reconstructed fields. When compared including...
The NASA space telescope $TESS$ is currently in the extended mission of its all-sky search for new transiting planets. Of thousands candidates that TESS expected to deliver, planets orbiting nearby M dwarfs are particularly interesting targets since they provide a great opportunity characterize their atmospheres by transmission spectroscopy. We aim validate and sub-Neptune-sized planet candidate TOI-2136.01 dwarf ($d = 33.36 \pm 0.02$ pc, $T_{eff} 3373 108$ K) with an orbital period 7.852...
Abstract Sub-Neptunes with radii of 2–3 R ⊕ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties bulk compositions transiting sub-Neptunes provide clues to the formation evolution close-in small In this paper, we present discovery follow-up four orbiting M dwarfs (TOI-782, TOI-1448, TOI-2120, TOI-2406), three which were newly validated by ground-based observations statistical analyses. TOI-782 b, TOI-1448 TOI-2120 TOI-2406 b have <mml:math...
We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting nearby (42 pc) M dwarf with period 27.3 days. identified transit signal from Transiting Exoplanet Survey Satellite photometric data, which we confirmed ground-based observations using multiband imagers MuSCAT2 and MuSCAT3. Combining these data other follow-up including high resolution spectroscopy Tillinghast Reflector Echelle Spectrograph, imaging SPeckle Polarimeter, radial velocity (RV) measurements InfraRed...
We report the discovery of one super-Earth- (TOI-1749b) and two sub-Neptune-sized planets (TOI-1749c TOI-1749d) transiting an early M dwarf at a distance 100~pc, which were first identified as planetary candidates using data from TESS photometric survey. have followed up this system ground by means multiband transit photometry, adaptive-optics imaging, low-resolution spectroscopy, we validated nature candidates. find that TOI-1749b, c, d orbital periods 2.39, 4.49, 9.05 days, radii 1.4, 2.1,...
Sub-Neptunes with $2-3R_\oplus$ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties bulk compositions of transiting sub-Neptunes provide clues to the formation evolution close-in small In this paper, we present discovery follow-up four orbiting M dwarfs (TOI-782, TOI-1448, TOI-2120, TOI-2406), three which were newly validated by ground-based observations statistical analyses. TOI-782 b, TOI-1448 TOI-2120 TOI-2406 b have radii $R_\mathrm{p} =...
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds thousands stars across entire sky. M-type planet hosts are ideal targets this due to their smaller size and cooler temperatures, which makes it easier detect planets near or within habitable zones. Additionally, M dwarfs have a contrast ratio between star, making measure planet’s properties accurately. Here, we report validation analysis 13 exoplanet candidates orbiting around dwarfs. We studied...
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds thousands stars across entire sky. M-type planet hosts are ideal targets this due to their smaller size and cooler temperatures, which makes it easier detect planets near or within habitable zones. Additionally, M~dwarfs have a contrast ratio between star, making measure planet's properties accurately. Here, we report validation analysis 13 exoplanet candidates orbiting around M dwarfs. We studied...
Context. Exoplanets with orbital periods of less than one day are known as ultra-short period (USP) planets. They relatively rare products planetary formation and evolution processes, but especially favourable for characterisation current planet detection methods. At the time writing, 125 USP planets have already been confirmed. Aims. Our aim is to validate nature two new transiting candidates around M dwarfs announced by NASA Transiting Exoplanet Survey Satellite (TESS), registered TESS...
The NASA space telescope $TESS$ is currently in the extended mission of its all-sky search for new transiting planets. Of thousands candidates that TESS expected to deliver, planets orbiting nearby M dwarfs are particularly interesting targets since they provide a great opportunity characterize their atmospheres by transmission spectroscopy. We aim validate and sub-Neptune-sized planet candidate TOI-2136.01 dwarf ($d = 33.36 \pm 0.02$ pc, $T_{eff} 3373 108$ K) with an orbital period 7.852...
This work presents a new physically-motivated supervised machine learning method, Hydro-BAM, to reproduce the three-dimensional Lyman-$α$ forest field in real and redshift space from reference hydrodynamic simulation, thereby saving about 7 orders of magnitude computing time. We show that our method is accurate up $k\sim1\,h\,\rm{Mpc}^{-1}$ one- (PDF), two- (power-spectra) three-point (bi-spectra) statistics reconstructed fields. When compared simulation including distortions, achieves...