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

    • TESS's first planet. A super-Earth transiting the naked-eye star π Mensae
      We report on the confirmation and mass determination of π Men c, the first transiting planet discovered by NASA's TESS space mission. π Men is a naked-eye (V = 5.65 mag), quiet G0 V star that was previously known to host a sub-stellar companion (π Men b) on a longperiod (Porb = 2091 days), eccentric (e = 0.64) orbit. Using TESS time-series
      Gandolfi, D. et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      96
    • A chemical survey of exoplanets with ARIEL
      Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of these exoplanets remains largely mysterious: there is no known, discernible pattern linking the presence, size, or orbital
      Tinetti, Giovanna et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      298
    • A candidate super-Earth planet orbiting near the snow line of Barnard's star
      Barnard's star is a red dwarf, and has the largest proper motion (apparent motion across the sky) of all known stars. At a distance of 1.8 parsecs1, it is the closest single star to the Sun; only the three stars in the α Centauri system are closer. Barnard's star is also among the least magnetically active red dwarfs known2,3 and has an estimated
      Ribas, I. et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      121
    • TESS Discovery of a Transiting Super-Earth in the pi Mensae System
      We report the detection of a transiting planet around π Men (HD 39091), using data from the Transiting Exoplanet Survey Satellite (TESS). The solar-type host star is unusually bright (V = 5.7) and was already known to host a Jovian planet on a highly eccentric, 5.7 yr orbit. The newly discovered planet has a size of 2.04 ± 0.05 R ⊕ and an orbital
      Huang, Chelsea X. et al.

      Fecha de publicación:

      12
      2018
      Número de citas
      168
    • The CARMENES search for exoplanets around M dwarfs. Nine new double-line spectroscopic binary stars
      Context. The CARMENES spectrograph is surveying ˜300 M dwarf stars in search for exoplanets. Among the target stars, spectroscopic binary systems have been discovered, which can be used to measure fundamental properties of stars. Aims: Using spectroscopic observations, we determine the orbital and physical properties of nine new double-line
      Baroch, D. et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      37
    • First light with HiPERCAM on the GTC
      HiPERCAM is a quintuple-beam imager that saw first light on the 4.2 m William Herschel Telescope (WHT) in October 2017 and on the 10.4 m Gran Telescopio Canarias (GTC) in February 2018. The instrument uses re- imaging optics and 4 dichroic beamsplitters to record ugriz (300-1000 nm) images simultaneously on its five CCD cameras. The detectors in
      Dhillon, Vik et al.

      Fecha de publicación:

      7
      2018
      Número de citas
      14
    • CARMENES: high-resolution spectra and precise radial velocities in the red and infrared
      The design and construction of CARMENES has been presented at previous SPIE conferences. It is a next-generation radial-velocity instrument at the 3.5m telescope of the Calar Alto Observatory, which was built by a consortium of eleven Spanish and German institutions. CARMENES consists of two separate échelle spectrographs covering the wavelength
      Quirrenbach, A. et al.

      Fecha de publicación:

      7
      2018
      Número de citas
      93
    • ELT-HIRES, the high resolution spectrograph for the ELT: results from the Phase A study
      We present the results from the phase A study of ELT-HIRES, an optical-infrared High Resolution Spectrograph for ELT, which has just been completed by a consortium of 30 institutes from 12 countries forming a team of about 200 scientists and engineers. The top science cases of ELT-HIRES will be the detection of life signatures from exoplanet
      Marconi, A. et al.

      Fecha de publicación:

      7
      2018
      Número de citas
      8
    • Spitzer's Search for Proxima Centauri b Transits
      Proxima Centauri, the nearest star to the sun, hosts a habitable-zone planet (Anglada-Escude' et al. 2016 Nature 536, 437). Several teams have sought Proxima b's transits using ground-based photometry, and have reported tentative transit detections (Liu et al. 2018 AJ 155, 12; Blank et al. 2018 AJ 155, 228; others). Proxima, a modest-sized M-dwarf
      Harrington, Joseph et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      0
    • Super-Earth of 8 M⊕ in a 2.2-day orbit around the K5V star K2-216
      Context. Although thousands of exoplanets have been discovered to date, far fewer have been fully characterised, in particular super-Earths. The KESPRINT consortium identified K2-216 as a planetary candidate host star in the K2 space mission Campaign 8 field with a transiting super-Earth. The planet has recently been validated as well. Aims: Our
      Persson, C. M. et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      39
    • Kepler Object of Interest Network. II. Photodynamical modelling of Kepler-9 over 8 years of transit observations
      Context. The Kepler Object of Interest Network (KOINet) is a multi-site network of telescopes around the globe organised to follow up transiting planet-candidate Kepler objects of interest (KOIs) with large transit timing variations (TTVs). Its main goal is to complete their TTV curves, as the Kepler telescope no longer observes the original Kepler
      Freudenthal, J. et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      24
    • The CARMENES search for exoplanets around M dwarfs. A Neptune-mass planet traversing the habitable zone around HD 180617
      Despite their activity, low-mass stars are of particular importance for the search of exoplanets by the means of Doppler spectroscopy, as planets with lower masses become detectable. We report on the discovery of a planetary companion around HD 180617, a bright (J = 5.58 mag), low-mass (M = 0.45M⊙) star of spectral type M2.5 V. The star, located at
      Kaminski, A. et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      45
    • Mass determination of the 1:3:5 near-resonant planets transiting GJ 9827 (K2-135)
      Context. Multiplanet systems are excellent laboratories to test planet formation models as all planets are formed under the same initial conditions. In this context, systems transiting bright stars can play a key role, since planetary masses, radii, and bulk densities can be measured. Aims: GJ 9827 (K2-135) has recently been found to host a tightly
      Prieto-Arranz, J. et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      23
    • Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet b and the discovery of a second planet
      The source GJ1132 is a nearby red dwarf known to host a transiting Earth-size planet. After its initial detection, we pursued an intense follow-up with the HARPS velocimeter. We now confirm the detection of GJ1132b with radial velocities alone. We refined its orbital parameters, and in particular, its mass (mb = 1.66 ± 0.23 M⊕), density (ρb = 6.3 ±
      Bonfils, X. et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      61
    • Aerosols and Water Ice in Jupiter’s Stratosphere from UV-NIR Ground-based Observations
      Jupiter’s atmosphere has been sounded in transmission from the UV to the IR, as if it were a transiting exoplanet, by observing Ganymede while passing through Jupiter’s shadow. The spectra show strong extinction due to the presence of aerosols and haze in Jupiter’s atmosphere and strong absorption features of methane. Here, we report a new detailed
      López-Puertas, Manuel et al.

      Fecha de publicación:

      10
      2018
      Número de citas
      6
    • A Large Ground-based Observing Campaign of the Disintegrating Planet K2-22b
      We present 45 ground-based photometric observations of the K2-22 system collected between 2016 December and 2017 May, which we use to investigate the evolution of the transit of the disintegrating planet K2-22b. Last observed in early 2015, in these new observations we recover the transit at multiple epochs and measure a typical depth of
      Colón, Knicole D. et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      8
    • The Transiting Exoplanet Community Early Release Science Program for JWST
      The James Webb Space Telescope (JWST) presents the opportunity to transform our understanding of planets and the origins of life by revealing the atmospheric compositions, structures, and dynamics of transiting exoplanets in unprecedented detail. However, the high-precision, timeseries observations required for such investigations have unique
      Bean, Jacob L. et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      115
    • A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
      A key legacy of the recently launched the Transiting Exoplanet Survey Satellite (TESS) mission will be to provide the astronomical community with many of the best transiting exoplanet targets for atmospheric characterization. However, time is of the essence to take full advantage of this opportunity. The James Webb Space Telescope (JWST), although
      Kempton, E. M.-R. et al.

      Fecha de publicación:

      11
      2018
      Número de citas
      404
    • SPECULOOS: a network of robotic telescopes to hunt for terrestrial planets around the nearest ultracool dwarfs
      We present here SPECULOOS, a new exoplanet transit search based on a network of 1m-class robotic telescopes targeting the 1200 ultracool (spectral type M7 and later) dwarfs bright enough in the infrared (K-mag
      Delrez, Laetitia et al.

      Fecha de publicación:

      7
      2018
      Número de citas
      46
    • The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
      The black hole transient V404 Cygni exhibited a bright outburst in June 2015 that was intensively followed over a wide range of wavelengths. Our team obtained high time resolution optical spectroscopy (! ˜ ! 90 s), which included a detailed coverage of the most active phase of the event. We present a data base consisting of 651 optical spectra
      Mata Sánchez, D. et al.

      Fecha de publicación:

      12
      2018
      Número de citas
      26

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