E. L. Martı́n
A5088865970- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Molecular Spectroscopy and Structure
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- History and Developments in Astronomy
- Pulsars and Gravitational Waves Research
- Analytical Chemistry and Sensors
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Spectroscopy and Chemometric Analyses
- Atmospheric and Environmental Gas Dynamics
- Scientific Research and Discoveries
- Particle Detector Development and Performance
- CCD and CMOS Imaging Sensors
- High-pressure geophysics and materials
- Nuclear physics research studies
- Analytical Methods in Pharmaceuticals
- Calibration and Measurement Techniques
Instituto de Astrofísica de Canarias
2009-2025
Universidad de La Laguna
1994-2023
Unidades Centrales Científico-Técnicas
2020-2023
Consejo Superior de Investigaciones Científicas
2009-2023
Concordia University
2022
Endesa (Spain)
2022
Centro de Astrobiología
2012-2021
Instituto Nacional de Técnica Aeroespacial
2003-2019
Université Claude Bernard Lyon 1
2014
Office of Legacy Management
2013
We present spectra for 12 new ultracool dwarfs found in the DENIS infrared survey. Seven of them have spectral types at bottom M-class (M8–M9.5), and other five belong to cooler "L" class. also two L by EROS 2 proper-motion introduce a scheme dwarf classification that is based on an extension pseudocontinuum ratio previously defined M dwarfs. For calibrating subclasses, we use temperature scale late-M recently obtained Basri et al. from synthetic spectrum fitting high-resolution profiles Cs...
We present photometric and spectroscopic observations of 23 high-redshift supernovae (SNe) spanning a range z = 0.34-1.03, nine which are unambiguously classified as Type Ia. These SNe were discovered during the IfA Deep Survey, began in 2001 September observed total 2.5 deg2 to depth approximately m ≈ 25-26 RIZ over 9-17 visits, typically every 1-3 weeks for nearly 5 months, with additional continuing until 2002 April. give brief description survey motivations, observational strategy,...
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 Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
We present the discovery by optical and near-infrared imaging of an extremely red, low-luminosity population isolated objects in young, nearby stellar cluster around multiple, massive star σ Orionis. The proximity (352 parsecs), youth (1 million to 5 years), low internal extinction make this ideal site explore substellar domain from hydrogen mass limit down a few Jupiter masses. Optical low-resolution spectroscopy three these confirms very cool spectral energy distribution (atmospheric...
We present Keck HIRES spectra of 6 late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures the objects using detailed atmospheric models fine analysis alkali resonance absorption lines CsI RbI. These yield mutually consistent results (+-150 K) when we use ``cleared-dust'' models, which account for removal refractory species from molecular states but do not include dust opacities. find a tendency RbI line imply slightly higher temperature, ascribe an incomplete treatment...
view Abstract Citations (223) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopy of a Brown Dwarf Candidate in the alpha Persei Open Cluster Rebolo, Rafael ; Martin, Eduardo L. Magazzu, Antonio Intermediate-resolution spectroscopy range 625-775 nm is reported for faint very-late-type object discovered two CCD images taken near center Alpha Per cluster. The spectrum shows strong absorption molecular bands, H-alpha emission, and KI...
We present intermediate- and low-resolution optical spectra around Hα Li i λ6708 Å for a sample of 25 low mass stars 2 brown dwarfs with confirmed membership in the pre-main sequence stellar σ Orionis cluster. Our observations are intended to investigate age The spectral types derived our target found be range K6–M8.5, which corresponds interval roughly 1.2–0.02 on basis state-of-the-art evolutionary models. Radial velocities (except one object) consistent Orion complex. All cluster members...
As part of our on-going investigation into the magnetic field properties ultracool dwarfs, we present simultaneous radio, X-ray, and Hα observations three M9.5-L2.5 dwarfs (BRI 0021-0214, LSR 060230.4+391059,and 2MASS J052338.2-140302).We do not detect X-ray or radio emission from any sources, despite previous detections BRI 0021 2M0523-14.Steady variable are detected 2M0523-14 0021, respectively, while no is 0602+39.Overall, survey nine M8-L5 doubles number observed in X-rays, triples L...
We report on our analysis of the VISTA Orion ZYJHKs photometric data (completeness magnitudes Z=22.6 and J=21.0mag) focusing a circular area 2798.4 arcmin^2 around young sigma Orionis star cluster (~3Myr, ~352pc, solar metallicity). The combination photometry with optical, WISE Spitzer allows us to identify total 210 member candidates masses in interval 0.25-0.004Msun, 23 which are new planetary-mass object findings. These discoveries double number known so far. One has colors compatible T...
It has been posited that lunar eclipse observations may help predict the in-transit signature of Earth-like extrasolar planets. However, a comparative analysis two phenomena addressing in detail transport stellar light through planet's atmosphere not yet presented. Here, we proceed with investigation both by making use common formulation. Our starting point is set previously unpublished near-infrared spectra collected at various phases during August 2008 eclipse. We then take formulation to...
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...
We present precise photospheric parameters of 282 M dwarfs determined from fitting the most recent version PHOENIX models to high-resolution CARMENES spectra in visible (0.52 - 0.96 $\mu$m) and near-infrared wavelength range (0.96 1.71 $\mu$m). With its aim search for habitable planets around dwarfs, several different masses have been detected. The characterization target sample is important ability derive constrain physical properties any planetary systems that are As a continuation...
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 initial results of a deep CCD survey for very low mass pre?main-sequence (PMS) stars in selected fields Taurus molecular cloud complex. The reported herein span little over half square degree dark clouds L1495, L1529, L1551, and B209. Our is complete down to IC ~ 19 at (R - I)C 2.5, which enables us probe well below hydrogen burning limit 1?2 Myr. From follow-up spectroscopic observations we have identified nine new low-mass T Tauri (TTSs). A large fraction PMS objects...
The Optical Monitoring Camera (OMC) will observe the optical emission from prime targets of gamma-ray instruments onboard ESA mission INTEGRAL, with support JEM-X monitor in X-ray domain. This capability provide invaluable diagnostic information on nature and physics sources over a broad wavelength range. Its main scientific objectives are: (1) to observed by gamma- instruments, measuring time intensity structure for comparison variability at high energies, (2) brightness position...
We have detected a bright X-ray flare from the nearby (d = 5.0 pc) brown dwarf LP 944-20 with Chandra Advanced CCD Imaging Spectrometer-S. This is an old (500 Myr), rapidly rotating, lithium-bearing M9 object, bolometric luminosity of ≈6 × 1029 ergs s-1. It was only by during duration 1-2 hr near end 12.1 observation. The peak 1.2 1026 s-1 in brightest ≈550 s, corresponding to LX/Lbol ≈ 2 10-4. A total released 43,773 s observation, giving time-averaged 7 10-6. not before flare, 3 σ upper...
We report on the discovery of a free-floating methane dwarf toward direction young star cluster sigma Orionis. Based object's far-red optical and near-infrared photometry spectroscopy, we conclude that it is possible member this association. have named as S Ori J053810.1-023626 (S 70 abridged name). If true Orionis, comparison photometric spectroscopic properties with state-of-the-art evolutionary models yields mass 3 (+5/-1) Jupiter for ages between 1 Myr 8 Myr. The presence such low-mass...
We report the discovery of three very late T dwarfs in UKIRT Infrared Deep Sky Survey (UKIDSS) Third Data Release: ULAS J101721.40+011817.9 (ULAS1017), J123828.51+095351.3 (ULAS1238) and J133553.45+113005.2 (ULAS1335). detail optical near-infrared (NIR) photometry for all sources, mid-IR ULAS1335. use NIR spectra each source to assign spectral types T8p T8.5 T9 (ULAS1335) these objects. ULAS1017 is classed as a peculiar T8 (T8p) due appearing dwarf J band, whilst exhibiting H- K-band flux...
We present the discovery of a companion near deuterium-burning mass limit located at very wide distance, an angular separation 4.6'' ± 0.1'' (projected distance ~ 670 AU) from UScoCTIO 108, brown dwarf young Upper Scorpius association. Optical and near-infrared photometry spectroscopy confirm cool nature both objects, with spectral types M7 M9.5, respectively, that they are bona fide members association, showing low gravity features youth. Their masses, estimated comparison their bolometric...