Á. García-Piquer
A5042410482- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Metaheuristic Optimization Algorithms Research
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Spacecraft Design and Technology
- Advanced Multi-Objective Optimization Algorithms
- Evolutionary Algorithms and Applications
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Satellite Communication Systems
- Network Security and Intrusion Detection
- Calibration and Measurement Techniques
- Consumer Market Behavior and Pricing
- Radiation Effects in Electronics
- AI-based Problem Solving and Planning
- Particle physics theoretical and experimental studies
- Software Engineering Research
- Educational Games and Gamification
- Technology Adoption and User Behaviour
- Intelligent Tutoring Systems and Adaptive Learning
- Complex Network Analysis Techniques
Universitat Ramon Llull
2023-2024
Institute of Space Sciences
2013-2019
Universitat Autònoma de Barcelona
2019
Institut d'Estudis Espacials de Catalunya
2015-2019
Consejo Superior de Investigaciones Científicas
2014-2019
Centro de Astrobiología
2014
La Salle University
2009-2011
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. 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...
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,...
The distribution of exoplanets around low-mass stars is still not well understood. Such stars, however, present an excellent opportunity reaching down to the rocky and habitable planet domains. number current detections used for statistical purposes quite modest different surveys, using both photometry precise radial velocities, are searching planets M dwarfs. Our HARPS-N red dwarf exoplanet survey aimed at detection new a sample 78 selected together with subsequent characterization their...
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...
Purpose In today's ever-evolving digital job market, soft skills are increasingly important for university students to succeed in their future careers. This study identifies the that universities should prioritize most due significance employment market. Design/methodology/approach Using natural language processing (NLP) techniques, this analyzed 226 student writings described experiences of failure academic, personal and professional settings. Zero-shot classification was utilized identify...
Multiobjective evolutionary clustering algorithms are based on the optimization of several objective functions that guide search following a cycle algorithms. Their capabilities allow them to find better solutions than with conventional if suitable individual representation is selected. This paper provides detailed analysis three most relevant and useful representations-prototype-based, label-based, graph-based-through wide set synthetic data sets. Moreover, they also compared Experiments...
CARMENES, the new Calar Alto spectrograph especially built for radial-velocity surveys of exoearths around M dwarfs, is a very complicated system. For reaching goal 1 m/s accuracy, it appropriate not only to monitor stars with best observing procedure, but also parameters CARMENES subsystems and safely store all engineer science data. Here we describe data flow from different subsystems, through instrument control system pipeline, virtual-observatory server astronomers.
Targeted spectroscopic exoplanet surveys face the challenge of maximizing their planet detection rates by means careful planning. The number possible observation combinations for a large survey, i.e., sequence observations night after night, both in total time and amount targets, is enormous. Sophisticated scheduling tools improved understanding population are employed to investigate an efficient optimal way plan execution observations. This applied CARMENES instrument, which optical...