F. J. Alonso-Floriano
A5077389029- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
- Crystal Structures and Properties
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- Molecular Spectroscopy and Structure
- Ophthalmology and Visual Health Research
- Digital Filter Design and Implementation
- Catalysis and Oxidation Reactions
- Insect Pest Control Strategies
- Advanced Control Systems Optimization
- Historical Astronomy and Related Studies
- Porphyrin and Phthalocyanine Chemistry
- Iterative Learning Control Systems
- Space Exploration and Technology
Leiden University
2017-2020
Universidad Complutense de Madrid
2012-2019
Instituto de Astrofísica de Andalucía
2018
Universidad de La Laguna
2018
This paper gives an overview of the CARMENES instrument and survey that will be carried out with it during first years operation. (Calar Alto high-Resolution search for M dwarfs Exoearths Near-infrared optical Echelle Spectrographs) is a next-generation radial-velocity under construction 3.5m telescope at Calar Observatory by consortium eleven Spanish German institutions. The scientific goal project conducting 600-night exoplanet targeting ~ 300 completed instrument. consists two separate...
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...
Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5 m Calar Alto telescope. It optimally designed for radial-velocity surveys of M dwarfs with potentially habitable Earth-mass planets. Aims. We prepare list brightest, single in each spectral subtype observable from northern hemisphere, which we will select best planet-hunting targets CARMENES. Methods. In this first paper on preparation our input catalogue, compiled large amount public data and...
We present three transit observations of HD 189733 b obtained with the high-resolution spectrograph CARMENES at Calar Alto. A strong absorption signal is detected in near-infrared He I triplet 10830 Å all transits. During mid-transit, mean level $0.88\pm0.04$ % measured a $\pm$10 km s$^{-1}$ range net blueshift $-3.5\pm0.4$ (10829.84--10830.57 Å). The exhibits radial velocities $+6.5\pm3.1$ and $-12.6\pm1.0$ during ingress egress, respectively; planetary rest frame. show that stellar...
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...
CARMENES is a spectrograph for radial velocity surveys of M dwarfs with the aim detecting Earth-mass planets orbiting in habitable zones their host stars. To ensure an optimal use Guaranteed Time Observations, this paper we investigate correlation activity and rotation approximately 2200 dwarfs, ranging spectral type from M0.0 V to M9.0 V. We present new high-resolution spectroscopic observations FEROS, CAFE, HRS 500 dwarfs. For each observation, determined its measured Halpha index...
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,...
Hot gas giant exoplanets can lose part of their atmosphere due to strong stellar irradiation, and these losses affect physical chemical evolution. Studies atmospheric escape from have mostly relied on space-based observations the hydrogen Lyman-α line in far ultraviolet region, which is strongly affected by interstellar absorption. Using ground-based high-resolution spectroscopy, we detected excess absorption helium triplet at 1083 nanometers during transit Saturn-mass exoplanet WASP-69b, a...
Context: Recently, the He I triplet at 10830 \r{A} has been rediscovered as an excellent probe of extended and possibly evaporating atmospheres close-in transiting planets. This already resulted in detections this a handful planets, both from space ground. However, while strong signal is expected for hot Jupiter HD 209458 b, only upper limits have obtained so far. Aims: Our goal to measure helium excess absorption b assess atmosphere planet possible evaporation. Methods: We new...
Ultra-hot Jupiters are emerging as a new class of exoplanets. Studying their chemical compositions and temperature structures will improve the understanding mass loss rate well formation evolution. We present detection ionized calcium in two hottest giant exoplanets - KELT-9b WASP-33b. By utilizing transit datasets from CARMENES HARPS-N observations, we achieved high confidence level detections Ca II using cross-correlation method. further obtain transmission spectra around individual lines...
Aims: We search for low-mass companions of M dwarfs and characterize their multiplicity fraction with the purpose helping in selection most appropriate targets CARMENES exoplanet survey. Methods: obtained high-resolution images I band lucky imaging instrument FastCam at 1.5 m Telescopio Carlos Sanchez 490 mid- to late-M dwarfs. For all detected binaries, we measured angular separations, position angles, magnitude differences band. also calculated masses each individual component estimated...
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...
Aims. We explore the capabilities of CARMENES for characterising hot-Jupiter atmospheres by targeting multiple water bands, in particular, those at 1.15 and 1.4 μ m. Hubble Space Telescope observations suggest that this wavelength region is relevant distinguishing between hazy and/or cloudy clear atmospheres. Methods. observed one transit hot Jupiter HD 189733 b with CARMENES. Telluric stellar absorption lines were removed using S YSREM , which performs a principal component analysis...
We investigated almost 500 stars distributed among 193 binary or multiple systems made of late-F, G-, early-K primaries and late-K M dwarf companion candidates. For all them, we compiled measured coordinates, J-band magnitudes, spectral types, distances, proper motions.With these data, established a sample 192 physically bound systems. In parallel, carried out observations with HERMES/Mercator obtained high resolution spectra for the five secondaries. used automatic StePar code deriving...
HD 209458b was the first transiting planet discovered, and for which an atmosphere, in particular NaI, detected. With time, it has become one of most frequently studied planets, with a large diversity atmospheric studies using low- high-resolution spectroscopy. Here, we present transit spectroscopy observations HARPS-N CARMENES spectrographs. We fit Rossiter-McLaughlin effect by combining radial velocity data from both instruments (nine transits total), measuring projected spin-orbit angle...