A5026962940- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- SAS software applications and methods
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Astrophysics and Cosmic Phenomena
- Planetary Science and Exploration
- Spectroscopy and Chemometric Analyses
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Historical and socio-economic studies of Spain and related regions
- Astronomical and nuclear sciences
- Isotope Analysis in Ecology
- Advanced Fiber Laser Technologies
- Crystal Structures and Properties
- Atmospheric Ozone and Climate
- Computational Physics and Python Applications
- Advanced Electrical Measurement Techniques
- Photosynthetic Processes and Mechanisms
Calar Alto Observatory
2011-2023
Junta de Andalucía
2022-2023
Consejo Superior de Investigaciones Científicas
2007-2019
Universidad Complutense de Madrid
1996-2010
We report the detection of a transiting Earth-size planet around GJ 357, nearby M2.5 V star, using data from Transiting Exoplanet Survey Satellite (TESS). 357 b (TOI-562.01) is transiting, hot, Earth-sized ( T eq = 525 ± 11 K) with radius R 1.217 0.084 ⊕ and an orbital period P 3.93 d. Precise stellar radial velocities CARMENES PFS, as well archival HIRES, UVES, HARPS also display 3.93-day periodicity, confirming planetary nature leading to mass M 1.84 0.31 . In addition velocity signal for...
The CARMENES instrument is a pair of high-resolution (R⪆80,000) spectrographs covering the wavelength range from 0.52 to 1.71 μm, optimized for precise radial velocity measurements. It was installed and commissioned at 3.5m telescope Calar Alto observatory in Southern Spain 2015. first large science program survey ~ 300 M dwarfs, which started on Jan 1, 2016. We present an overview all subsystems (front end, fiber system, visible-light spectrograph, near-infrared calibration units, etalons,...
M dwarfs are known to generate the strongest magnetic fields among main-sequence stars with convective envelopes, but link between and underlying dynamo mechanisms, rotation, activity still lacks a consistent picture. In this work we measure from high-resolution near-infrared spectra taken CARMENES radial-velocity planet survey in sample of 29 active compare our results against stellar parameters. We use state-of-the-art radiative transfer code total flux densities Zeeman broadening spectral...
The new CARMENES instrument comprises two high-resolution and high-stability spectrographs that are used to search for habitable planets around M dwarfs in the visible near-infrared regime via Doppler technique. Characterising our target sample is important constraining physical properties of any planetary systems detected. aim this paper determine fundamental stellar parameters M-dwarf from spectra observed with CARMENES. We also include several other spectrographs, CAFE, FEROS, HRS,...
Context. The Calar Alto high-Resolution search for M dwarfs with Exo-earths Near-infrared and optical Echelle Spectrographs (CARMENES) survey is searching Earth-like planets orbiting using the radial velocity method. Studying stellar activity of target stars important to avoid false planet detections improve our understanding atmospheres late-type stars. Aims. In this work we present measurements indicators at visible near-infrared wavelengths 331 observed CARMENES. Our aim identify that are...
For years, the standard procedure to measure radial velocities (RVs) of spectral observations consisted in cross-correlating spectra with a binary mask, that is, simple stellar template contains information on position and strength absorption lines. The cross-correlation function (CCF) profiles also provide several indicators activity. We present methodology first build weighted masks and, second, compute CCF these from which we derive activity indicators. These methods are implemented...
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...
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...
We present the Pmas/ppak Integral-field Supernova hosts COmpilation (PISCO) which comprises Integral Field Spectroscopy (IFS) of 232 supernova (SN) host galaxies, that hosted 272 SNe, observed over several semesters with 3.5m telescope at Calar Alto Observatory (CAHA). PISCO is largest collection SN galaxies wide-field IFS, totaling 466,347 individual spectra covering a typical spatial resolution $\sim$380 pc. While focused studies regarding specific Ia- related topics will be published...
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....
In this letter we investigate the kinematical properties of early-type dwarfs by significantly enlarging scarce observational sample so far available. We present rotation curves and mean velocity dispersions for four bright dwarf ellipticals two lenticular galaxies in Virgo cluster. Most these exhibit conspicuous curves. particular, five out six new are found to be close predictions oblate spheroids flattened rotation. Therefore, contrary previous hints, data suggest that an important...
We announce the discovery of two planets orbiting M dwarfs GJ 251 (0.360 ± 0.015 ⊙ ) and HD 238090 (0.578 0.021 based on CARMENES radial velocity (RV) data. In addition, we independently confirm with data existence Lalande 21185 b, a planet that has recently been discovered SOPHIE spectrograph. All three belong to class warm or temperate super-Earths share similar properties. The orbital periods are 14.24 d, 13.67 12.95 d minimum masses 4.0 0.4 ⊕ , 6.9 0.9 2.7 0.3 for respectively. Based...
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...
Light from celestial objects interacts with the molecules of Earth’s atmosphere, resulting in production telluric absorption lines ground-based spectral data. Correcting for these lines, which strongly affect red and infrared wavelengths, is often needed a wide variety scientific applications. Here, we present template division modeling (TDTM) technique, method accurately removing stars that exhibit numerous intrinsic features. Based on barycentric motion throughout year, our approach suited...
Broad-band (ultraviolet to near-infrared) observations of the intense gamma ray burst GRB 990123 started ∼8.5 hours after event and continued until 18 February 1999. When combined with other data, in particular from Robotic Telescope Transient Source Experiment (ROTSE) Hubble Space (HST), evidence emerges for a smoothly declining light curve, suggesting some color dependence that could be related cooling break passing ultraviolet-optical band at about 1 day high-energy event. The steeper...
We present new observational results on the kinematical, morphological, and stellar population properties of a sample 21 dEs located both in Virgo Cluster field, which show that 52% (1) are rotationally supported, (2) exhibit structural signs typical rotating systems such as disks, bars, or spiral arms, (3) younger (∼3 Gyr) than non-rotating dEs, (4) preferentially either outskirts field. This evidence is consistent with idea supported dwarfs late-type spirals irregulars recently entered...
Deriving metallicities for solar-like stars follows well-established methods, but cooler such as M dwarfs, the determination is much more complicated due to forests of molecular lines that are present. Several methods have been developed in recent years determine accurate stellar parameters these cool ($T_{\rm eff} \lesssim$ 4000 K). However, significant differences can be found at times when comparing same star derived using different methods. In this work, we effective temperatures,...
Ultra-hot Jupiters are highly irradiated gas giant exoplanets on close-in orbits around their host stars. We analyzed high-resolution spectra from CARMENES, HARPS-N, and ESPaDOnS taken over eight observation nights to study the emission spectrum of WASP-33b draw conclusions about its atmosphere. By applying cross-correlation technique, we detected spectral signatures Ti I, V a tentative signal II for first time via spectroscopy. These detections an important finding because fundamental role...
We present a homogeneous set of stellar atmospheric parameters (T eff , log g, [Fe/H]) for sample about 700 field and cluster stars which constitute new library in the near-IR developed population synthesis this spectral region ðl8350-9020Þ.Having compiled available data literature stars, we have found systematic deviations between from different bibliographic references.The Soubiran, Katz & Cayrel with very well determined fundamental has been taken as our standard reference system, other...
We present here CAFE, the Calar Alto Fiber-fed Echelle spectrograph, a new instrument built at Centro Astronomico Hispano Alemán (CAHA). CAFE is single fiber, high-resolution ($R\sim$70000) covering wavelength range between 3650-9800Å. It was on basis of common design for spectrographs. Its main aim to measure radial velocities stellar objects up $V\sim$13-14 mag with precision as good few tens $m s^{-1}$. To achieve this goal simplified maximum, removing all possible movable components,...