C. Cifuentes
A5079365086- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Space Exploration and Technology
- Structural Behavior of Reinforced Concrete
- Construction Engineering and Safety
- Scientific Measurement and Uncertainty Evaluation
- Atmospheric Ozone and Climate
- Scientific Computing and Data Management
- History and Developments in Astronomy
- High-pressure geophysics and materials
- Structural Engineering and Vibration Analysis
- Isotope Analysis in Ecology
- Astrophysical Phenomena and Observations
- Atmospheric and Environmental Gas Dynamics
- Advanced X-ray and CT Imaging
- Spectroscopy and Laser Applications
Centro de Astrobiología
2018-2025
European Space Astronomy Centre
2019-2024
National Postdoctoral Association
2023
The University of Sydney
2023
Centre de Recerca Matemàtica
2023
Instituto Nacional de Técnica Aeroespacial
2019-2021
Consejo Superior de Investigaciones Científicas
2019-2021
Universidad Complutense de Madrid
2017-2019
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the sample by publishing one spectrum each dwarf. These spectra cover wavelength range 520--1710nm at a resolution of least $R > 80,000$, and measure its RV, H$\alpha$ emission, projected rotation velocity. We an atlas high-resolution M-dwarf compare atmospheric models. To quantify RV precision that can be achieved in low-mass stars over range, analyze our...
We determine the radii and masses of 293 nearby, bright M dwarfs CARMENES survey. This is first time that such a large homogeneous high-resolution (R>80 000) spectroscopic survey has been used to derive these fundamental stellar parameters. derived using Stefan-Boltzmann's law. obtained required effective temperatures $T_{\rm eff}$ from spectral analysis we luminosities L integrated broadband photometry together with Gaia DR2 parallaxes. The mass was then determined mass-radius relation...
Context. Teegarden's Star is the brightest and one of nearest ultra-cool dwarfs in solar neighbourhood. For its late spectral type (M7.0V), star shows relatively little activity a prime target for near-infrared radial velocity surveys such as CARMENES. Aims. As part CARMENES search exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements analysed them planetary signals. Methods. We find periodic variability velocities Star. also studied photometric to rule out...
Context: The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M-dwarfs included in sample had been observed before with HIRES and HARPS either were reported have one short period planetary companion (GJ15A, GJ176, GJ436, GJ536 GJ1148) or are multiple systems (GJ581 GJ876). Aims: We aim report new precise optical radial velocity measurements for these planet hosts test overall capabilities CARMENES. Methods: combined our Doppler those available...
High resolution transit spectroscopy has proven to be a reliable technique for the characterization of chemical composition exoplanet atmospheres. Taking advantage broad spectral coverage CARMENES spectrograph, we initiated survey aimed at characterizing range planetary systems. Here, report our observations three transits \tplanet with in search \het\ absorption. On one nights, He~{\sc i} region was heavily contaminated by OH$^-$ telluric emission and, thus, it not useful purposes. The...
We determined effective temperatures, surface gravities, and metallicities for a sample of 343 M dwarfs observed with CARMENES, the double-channel, high-resolution spectrograph installed at 3.5 m telescope Calar Alto Observatory. employed S TE P AR YN , Bayesian spectral synthesis implementation particularly designed to infer stellar atmospheric parameters late-type stars following Markov chain Monte Carlo approach. made use BT-Settl model atmospheres radiative transfer code turbospectrum...
The CARMENES instrument was conceived to deliver high-accuracy radial velocity (RV) measurements with long-term stability search for temperate rocky planets around a sample of nearby cool stars. broad wavelength coverage designed provide range stellar activity indicators assess the nature potential RV signals and valuable spectral information help characterise targets. Data Release 1 (DR1) makes public all observations obtained during guaranteed time observations, which ran from 2016 2020...
The two known planets in the planetary system of Teegarden’s Star are among most Earth-like exoplanets currently known. Revisiting this nearby with habitable zone aims at a more complete census around very low-mass stars. A significant number new radial velocity measurements from CARMENES, ESPRESSO, MAROON-X, and HPF, as well photometry TESS motivated deeper search for additional planets. We confirm refine orbital parameters know b c. also report detection third planet d an period 26.13 ±...
Aims. Knowledge of rotation periods ( P rot ) is important for understanding the magnetic activity and angular momentum evolution late-type stars, as well evaluating radial velocity signals potential exoplanets identifying false positives. We measured photometric spectroscopic a large sample nearby bright M dwarfs with spectral types from M0 to M9, part our continual effort fully characterize Guaranteed Time Observation programme stars CARMENES survey. Methods. analyse light curves chiefly...
We present the discovery and characterisation of two transiting planets observed by Transiting Exoplanet Survey Satellite (TESS) orbiting nearby (d ~ 22 pc), bright (J 9 mag) M3.5 dwarf LTT 3780 (TOI-732). confirm both their association with via ground-based photometry determine masses using precise radial velocities measured CARMENES spectrograph. Precise stellar parameters determined from high resolution spectra that is a mid-M an effective temperature T_eff = 3360 +\- 51 K, surface...
The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5 V star at just 8 pc with warm transiting rocky planet about 1.3 R_Terra and 3.0 M_Terra that is ideal for both transmission emission spectroscopy testing interior models telluric planets. To prepare future studies, we collected light curves seven new transits observed the CHEOPS space mission radial velocities obtained MAROON-X/Gemini North CARMENES/Calar Alto telescopes, together previously published...
We present the discovery of an Earth-mass planet ( M b sin i = 1.26 ± 0.21 ⊕ ) on a 15.6 d orbit relatively nearby ~ 9.6 pc) and low-mass (0.167 0.011 ⊙ M5.0 V star, Wolf 1069. Sitting at separation 0.0672 0.0014 au away from host star puts 1069 in habitable zone (HZ), receiving incident flux S 0.652 0.029 . The planetary signal was detected using telluric-corrected radial-velocity (RV) data CARMENES spectrograph, amounting to total 262 spectroscopic observations covering almost four years....
Context. Detecting a planetary companion in short-period orbit through radio emission from the interaction with its host star is new prospect exoplanet science. Recently, tantalising signal was found close to low-mass stellar system GJ 1151 using LOFAR observations. Aims. We studied spectroscopic time-series data of order search for companions, investigate possible signatures magnetic activity, and find explanations signal. Methods. used combined radial velocities measured spectra acquired...
We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within CARMENES survey for exoplanets around M dwarfs. HD 147379 ($V = 8.9$ mag, $M 0.58 \pm 0.08$ M$_{\odot}$), bright M0.0V at distance of 10.7 pc, is found undergo periodic RV variations with semi-amplitude $K 5.1\pm0.4$ m s$^{-1}$ and period $P 86.54\pm0.06$ d. The signal in our data, which were taken between 2016 2017, supported HIRES/Keck that since 2000. are interpreted as...
Statistical analyses from exoplanet surveys around low-mass stars indicate that super-Earth and Neptune-mass planets are more frequent than gas giants such stars, in agreement with core accretion theory of planet formation. Using precise radial velocities derived visual near-infrared spectra, we report the discovery a giant minimum mass 0.46 Jupiter masses an eccentric 204-day orbit very star GJ 3512. Dynamical models show high eccentricity is most likely explained planet-planet...
Current exoplanet surveys using the radial velocity (RV) technique are targeting M dwarfs because any habitable zone terrestrial-mass planets will induce a high RV and orbit on shorter periods than for more massive stars. One of main caveats is that show wide range activity levels from inactive to very active, which can an asymmetry in line profiles and, consequently, spurious measurement. We aim benchmark impact stellar high-precision measurements regular-cadence CARMENES visible...