Exoplanetas y Astrobiología

    General
    Descripción

    La búsqueda de vida en el Universo se ha visto impulsada por los recientes descubrimientos de planetas alrededor de otras estrellas (los llamados exoplanetas), convirtiéndose en uno de los campos más activos dentro de la Astrofísica moderna. En los últimos años los descubrimientos cada vez más numerosos de nuevos exoplanetas y los últimos avances en el estudio de sus atmósferas no sólo están dándonos valiosa nueva información sobre sus propiedades físicas, sino que nos están permitiendo además poner las propiedades de los planetas de nuestro Sistema Solar dentro un contexto más global. El campo esta acercándose al importante descubrimiento de los primeros planetas potencialmente habitables, impulsando estudios más detallados de estos planetas. Con el lanzamiento de las nuevas misiones como JWST, CHEOPS, TESS, ARIEL o PLATO, al campo de exoplanetas se le plantea un futuro muy excitante.

    Es por esta razon que este campo se ayuda de y, a su vez motiva, el desarrollo de instrumentación cada vez más sensible y estable tanto para telescopios de tierra como para las misiones espaciales. Dos frentes para los que nuestro grupo esta especialmente preparado. Por un lado, durante los ultimos años hemos desarrollado tecnicas de observacion y reduccion de transitos de exoplanetas para los telescopios del ORM, siendo el nuestro uno de los grupos mas productivos en la explotacion de GTC. Por otro lado, todas las misiones espaciales ESA (presentes y futuras) relacionadas con exoplanetas cuentan con uno o varios de los componentes del proyecto como CoIs.

    En el marco de este proyecto, pretendemos que los investigadores del IAC mantengan una situación aventajada con la explotación de OSIRIS y EMIR, instrumentos de primera luz de GTC, y participen en la construcción, comisionado y operación de nuevos instrumentos, como el espectrografo óptico de alta resolución HORUS en el GTC. La explotacion de la fotometria y espectroscopia de transitos con LIRIS en el WHT es tambien uno de nuestros principales intereses, especialmente en preparacion de la instalacion en 2015 del instrumento EMIR en el GTC.

    En resumen, el proyecto "Exoplanetas y Astrobiologia" se centrará entorno a estas cuatro lineas principales de actuacion:

    1) Caracterización de las propiedades fisicas y atmosfericas de exoplanetas (GTC, WHT, HARPSN, CARMENES, ESPRESSO, ARIEL etc.)

    2) Búsquedas y confirmacion de exoplanetas por transitos (CoRoT, Kepler, K2, CHEOPS, XO, LCOGT, WFC, PLATO, etc.)

    3) Busquedas/ confirmacion de exoplanetas por velocidad radial (HARPSN, HORUS, LCOGT, SONG, CARMENES)

    4) Astrobiología

    Investigador principal
    Personal del proyecto
    1. Deteccion de He en la atmosfera de un exoplaneta por primera vez, publicado en Science.
    2. Deteccion de un planeta entorno a la estrella de Barnard, publicado en Nature
    3. Deteccion de los primeros planetas del la mision TESS, con varios articulos de impacto
    4. Descubrimiento de rasgos de Na y Halpha en el espectro de KELT-20b con el TNG
    5. Publicación del Handbook of Exoplanets, la obra de referencia más extenso en el campo de los exoplanetas. Este Manual fue editado por miembros de nuestro grupo e incluye contribuciones de unos 300 expertos en todo el mundo, incluidos 12 miembros de IAC.

    Publicaciones relacionadas

    • The GTC exoplanet transit spectroscopy survey. VI. Detection of sodium in WASP-52b's cloudy atmosphere
      We report the first detection of sodium absorption in the atmosphere of the hot Jupiter WASP-52b. We observed one transit of WASP-52b with the low-resolution Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at the 10.4 m Gran Telescopio Canarias (GTC). The resulting transmission spectrum, covering the
      Chen, G. et al.

      Fecha de publicación:

      4
      2017
      Número de citas
      45
    • The K2-ESPRINT project. VI. K2-105 b, a hot Neptune around a metal-rich G-dwarf
      We report on the confirmation that the candidate transits observed for the star EPIC 211525389 are due to a short-period Neptune-sized planet. The host star, located in K2 campaign field 5, is a metal-rich ([Fe/H] = 0.26 ± 0.05) G-dwarf (Teff = 5430 ± 70 K and log g = 4.48 ± 0.09), based on observations with the High Dispersion Spectrograph (HDS)
      Narita, Norio et al.

      Fecha de publicación:

      4
      2017
      Número de citas
      9
    • Mass determination of K2-19b and K2-19c from radial velocities and transit timing variations
      We present radial velocity follow-up observations of K2-19, a compact planetary system hosting three planets, of which the two larger ones, K2-19b and K2-19c, are close to the 3:2 mean motion resonance. An analysis considering only the radial velocity measurements detects K2-19b, the larger and more massive planet in the system, with a mass of 54.8
      Nespral, D. et al.

      Fecha de publicación:

      5
      2017
      Número de citas
      12
    • Optical and Near-infrared Spectra of σ Orionis Isolated Planetary-mass Objects
      We have obtained low-resolution optical (0.7–0.98 μm) and near-infrared (1.11–1.34 μm and 0.8–2.5 μm) spectra of 12 isolated planetary-mass candidates (J = 18.2–19.9 mag) of the 3 Myr σ Orionis star cluster with the aim of determining the spectroscopic properties of very young, substellar dwarfs and assembling a complete cluster mass function. We
      Zapatero Osorio, M. R. et al.

      Fecha de publicación:

      6
      2017
      Número de citas
      26
    • Primeval very low-mass stars and brown dwarfs - II. The most metal-poor substellar object
      SDSS J010448.46+153501.8 has previously been classified as an sdM9.5 subdwarf. However, its very blue J - K colour (-0.15 ± 0.17) suggests a much lower metallicity compared to normal sdM9.5 subdwarfs. Here, we re-classify this object as a usdL1.5 subdwarf based on a new optical and near-infrared spectrum obtained with X-shooter on the Very Large
      Zhang, Z. H. et al.

      Fecha de publicación:

      6
      2017
      Número de citas
      33
    • Multi-filter Transit Observations of HAT-P-3b and TrES-3b with Multiple Northern Hemisphere Telescopes
      We present a photometric follow-up of transiting exoplanets HAT-P-3b and TrES-3b, observed by using several optical and near-infrared filters, with four small-class telescopes (D = 36–152 cm) in the Northern Hemisphere. Two of the facilities present their first scientific results. New 10 HAT-P-3b light curves and new 26 TrES-3b light curves are
      Sada, P. V. et al.

      Fecha de publicación:

      6
      2017
      Número de citas
      11
    • From dense hot Jupiter to low-density Neptune: The discovery of WASP-127b, WASP-136b, and WASP-138b
      We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18±0.02 MJ and radius 1.37±0.04 RJ. This is one of the least massive planets discovered by the WASP project. It orbits a bright host star (Vmag = 10.16) of spectral type G5 with a period of 4.17 days. WASP-127b is a low
      Lam, K. W. F. et al.

      Fecha de publicación:

      2
      2017
      Número de citas
      60
    • A new L5 brown dwarf member of the Hyades cluster with chromospheric activity
      Aims: Our aim is to identify brown dwarf members of the nearby Hyades open star cluster to determine the photometric and spectroscopic properties of brown dwarfs at moderately old ages and extend the knowledge of the substellar mass function of the cluster. Methods: We cross-matched the 2MASS and AllWISE public catalogues and measured proper
      Pérez-Garrido, A. et al.

      Fecha de publicación:

      3
      2017
      Número de citas
      15
    • TEE, an estimator for the precision of eclipse and transit minimum times
      Context. Transit or eclipse timing variations have proven to be a valuable tool in exoplanet research. However, no simple way to estimate the potential precision of such timing measures has been presented yet, nor are guidelines available regarding the relation between timing errors and sampling rate. Aims: A timing error estimator (TEE) equation
      Deeg, H. J. et al.

      Fecha de publicación:

      3
      2017
      Número de citas
      10
    • K2-60b and K2-107b. A Sub-Jovian and a Jovian Planet from the K2 Mission
      We report the characterization and independent detection of K2-60b, as well as the detection and characterization of K2-107b, two transiting hot gaseous planets from the K2 space mission. We confirm the planetary nature of the two systems and determine their fundamental parameters combining the K2 time-series data with FIES@NOT and HARPS-N@TNG
      Eigmüller, P. et al.

      Fecha de publicación:

      3
      2017
      Número de citas
      20
    • EPIC 219388192b—An Inhabitant of the Brown Dwarf Desert in the Ruprecht 147 Open Cluster
      We report the discovery of EPIC 219388192b, a transiting brown dwarf in a 5.3 day orbit around a member star of Ruprecht 147, the oldest nearby open cluster association, which was photometrically monitored by K2 during its Campaign 7. We combine the K2 time-series data with ground-based adaptive optics imaging and high-resolution spectroscopy to
      Nowak, G. et al.

      Fecha de publicación:

      3
      2017
      Número de citas
      39
    • WD 1145+017 photometric observations during eight months of high activity
      WD 1145+017 was observed from 2015 November to 2016 July for the purpose of characterizing transit behavior of the white dwarf by dust clouds thought to be produced by fragments of an asteroid in close orbit with the star. Fortuitously, most of these observations were carried out during a time when the overall `dip' activity was dramatically
      Gary, B. L. et al.

      Fecha de publicación:

      3
      2017
      Número de citas
      51
    • Discovery of wide low and very low-mass binary systems using Virtual Observatory tools
      The frequency of multiple systems and their properties are key constraints of stellar formation and evolution. Formation mechanisms of very low-mass (VLM) objects are still under considerable debate, and an accurate assessment of their multiplicity and orbital properties is essential for constraining current theoretical models. Taking advantage of
      Gálvez-Ortiz, M. C. et al.

      Fecha de publicación:

      4
      2017
      Número de citas
      15
    • Optical and near-infrared linear polarization of low and intermediate-gravity ultracool dwarfs
      We aim to study the optical and near-infrared linear polarimetric properties of a sample of young M7-L7 dwarfs (≈ 1-500 Myr) with spectroscopic signatures of low- and intermediate-gravity atmospheres. We collected optical (RIZ) and near-infrared (YJHKs) linear polarimetry images on various time-scales from ˜0.2 h to months. Linear polarization
      Miles-Páez, P. A. et al.

      Fecha de publicación:

      4
      2017
      Número de citas
      13
    • A super-Earth orbiting the nearby M dwarf GJ 536
      We report the discovery of a super-Earth orbiting the star GJ 536 based on the analysis of the radial-velocity time series from the HARPS and HARPS-N spectrographs. GJ 536 b is a planet with a minimum mass Msini of 5.36 ± 0.69 M⊕; it has an orbital period of 8.7076 ± 0.0025 d at a distance of 0.066610(13) AU, and an orbit that is consistent with
      Suárez Mascareño, A. et al.

      Fecha de publicación:

      1
      2017
      Número de citas
      21
    • New planetary systems from the Calan-Hertfordshire Extrasolar Planet Search
      We report the discovery of eight new giant planets, and updated orbits for four known planets, orbiting dwarf and subgiant stars using the CORALIE, HARPS, and MIKE instruments as part of the Calan-Hertfordshire Extrasolar Planet Search. The planets have masses in the range 1.1-5.4 MJ's, orbital periods from 40 to 2900 d, and eccentricities from 0.0
      Jenkins, J. S. et al.

      Fecha de publicación:

      4
      2017
      Número de citas
      51
    • CARMENES input catalogue of M dwarfs. II. High-resolution imaging with FastCam
      Aims: We search for low-mass companions of M dwarfs and characterize their multiplicity fraction with the purpose of helping in the selection of the most appropriate targets for the CARMENES exoplanet survey. Methods: We obtained high-resolution images in the I band with the lucky imaging instrument FastCam at the 1.5 m Telescopio Carlos Sánchez
      Cortés-Contreras, M. et al.

      Fecha de publicación:

      1
      2017
      Número de citas
      75
    • EPIC 201702477b: A Transiting Brown Dwarf from K2 in a 41 day Orbit
      We report the discovery of EPIC 201702477b, a transiting brown dwarf in a long period (40.73691 ± 0.00037 day) and eccentric (e = 0.2281 ± 0.0026) orbit. This system was initially reported as a planetary candidate based on two transit events seen in K2 Campaign 1 photometry and later validated as an exoplanet candidate. We confirm the transit and
      Bayliss, D. et al.

      Fecha de publicación:

      1
      2017
      Número de citas
      40
    • Spectral energy distribution simulations of a possible ring structure around the young, red brown dwarf G 196-3 B
      The origin of the very red optical and infrared colours of intermediate-age (˜10-500 Myr) L-type dwarfs remains unknown. It has been suggested that low-gravity atmospheres containing large amounts of dust may account for the observed reddish nature. We explored an alternative scenario by simulating debris disc around G 196-3 B, which is an L3 young
      Zakhozhay, O. V. et al.

      Fecha de publicación:

      1
      2017
      Número de citas
      12
    • K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion
      We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19 ± 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We confirm the planetary nature of the companion with radial velocities, and determine that the star is a metal-rich ([Fe/H] = 0.20 ± 0.05) subgiant, with mass 1.60^{+0.14}_{-0.10} M⊙ and radius 3.1
      Smith, A. M. S. et al.

      Fecha de publicación:

      1
      2017
      Número de citas
      32

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