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General
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
Miembros
Resultados
- Deteccion de He en la atmosfera de un exoplaneta por primera vez, publicado en Science.
- Deteccion de un planeta entorno a la estrella de Barnard, publicado en Nature
- Deteccion de los primeros planetas del la mision TESS, con varios articulos de impacto
- Descubrimiento de rasgos de Na y Halpha en el espectro de KELT-20b con el TNG
- 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.
Actividad científica
Publicaciones relacionadas
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The Gravitational-wave Optical Transient Observer (GOTO): prototype performance and prospects for transient scienceThe Gravitational-wave Optical Transient Observer (GOTO) is an array of wide-field optical telescopes, designed to exploit new discoveries from the next generation of gravitational wave detectors (LIGO, Virgo, and KAGRA), study rapidly evolving transients, and exploit multimessenger opportunities arising from neutrino and very high energy gamma-raySteeghs, D. et al.
Fecha de publicación:
42022 -
HATS-74Ab, HATS-75b, HATS-76b, and HATS-77b: Four Transiting Giant Planets Around K and M DwarfsThe relative rarity of giant planets around low-mass stars compared with solar-type stars is a key prediction from the core-accretion planet formation theory. In this paper we report on the discovery of four gas giant planets that transit low-mass late K and early M dwarfs. The planets HATS-74Ab (TOI 737b), HATS-75b (TOI 552b), HATS-76b (TOI 555b)Jordán, Andrés et al.
Fecha de publicación:
32022 -
A Transiting, Temperate Mini-Neptune Orbiting the M Dwarf TOI-1759 Unveiled by TESSWe report the discovery and characterization of TOI-1759 b, a temperate (400 K) sub-Neptune-sized exoplanet orbiting the M dwarf TOI-1759 (TIC 408636441). TOI-1759 b was observed by TESS to transit in Sectors 16, 17, and 24, with only one transit observed per sector, creating an ambiguity regarding the orbital period of the planet candidate. GroundEspinoza, Néstor et al.
Fecha de publicación:
32022 -
A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPSWe report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed and retrieved the CHaracterising ExOPlanets Satellite (CHEOPS), TESS, and ground-based photometryWilson, Thomas G. et al.
Fecha de publicación:
32022 -
A 38 Million Year Old Neptune-sized Planet in the Kepler FieldKepler 1627A is a G8V star previously known to host a 3.8 R ⊕ planet on a 7.2 day orbit. The star was observed by the Kepler space telescope because it is nearby (d = 329 pc) and it resembles the Sun. Here, we show using Gaia kinematics, TESS stellar rotation periods, and spectroscopic lithium abundances that Kepler 1627 is a member of the ${38}_{Bouma, L. G. et al.
Fecha de publicación:
32022 -
TESS Giants Transiting Giants. II. The Hottest Jupiters Orbiting Evolved StarsGiant planets on short-period orbits are predicted to be inflated and eventually engulfed by their host stars. However, the detailed timescales and stages of these processes are not well known. Here, we present the discovery of three hot Jupiters (P < 10 days) orbiting evolved, intermediate-mass stars (M ⋆ ≍ 1.5 M ⊙, 2 R ⊙ < R ⋆ < 5 R ⊙). ByGrunblatt, Samuel K. et al.
Fecha de publicación:
32022 -
A candidate short-period sub-Earth orbiting Proxima CentauriContext. Proxima Centauri is the closest star to the Sun. This small, low-mass, mid M dwarf is known to host an Earth-mass exoplanet with an orbital period of 11.2 days within the habitable zone, as well as a long-period planet candidate with an orbital period of close to 5 yr. Aims: We report on the analysis of a large set of observations takenFaria, J. P. et al.
Fecha de publicación:
22022 -
Transit timings variations in the three-planet system: TOI-270We present ground- and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth and two sub-Neptunes discovered by TESS around a bright (K-mag = 8.25) M3V dwarf. The planets orbit near low-order mean-motion resonances (5:3 and 2:1) and are thus expected to exhibit large transitKaye, Laurel et al.
Fecha de publicación:
32022 -
Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflectionContext. The light curves of tidally locked hot Jupiters transiting fast-rotating, early-type stars are a rich source of information about both the planet and star, with full-phase coverage enabling a detailed atmospheric characterisation of the planet. Although it is possible to determine the true spin-orbit angle Ψ - a notoriously difficultHooton, M. J. et al.
Fecha de publicación:
22022 -
TOI-530b: a giant planet transiting an M-dwarf detected by TESSWe report the discovery of TOI-530b, a transiting Saturn-like planet around an M0.5V dwarf, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located at a distance of 147.7 ± 0.6 pc with a radius of R * = 0.54 ± 0.03 R ⊙ and a mass of M * = 0.53 ± 0.02 M ⊙. We verify the planetary nature of the transit signals byGan, Tianjun et al.
Fecha de publicación:
32022 -
Validation of 13 Hot and Potentially Terrestrial TESS PlanetsThe James Webb Space Telescope will be able to probe the atmospheres and surface properties of hot, terrestrial planets via emission spectroscopy. We identify 18 potentially terrestrial planet candidates detected by the Transiting Exoplanet Survey Satellite (TESS) that would make ideal targets for these observations. These planet candidates cover aGiacalone, Steven et al.
Fecha de publicación:
22022 -
TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarfWe report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining theseFukui, Akihiko et al.
Fecha de publicación:
22022 -
The CARMENES search for exoplanets around M dwarfs. Diagnostic capabilities of strong K I lines for photosphere and chromosphereThere are several strong K I lines found in the spectra of M dwarfs, among them the doublet near 7700 Å and another doublet near 12 500 Å. We study these optical and near-infrared doublets in a sample of 324 M dwarfs, observed with CARMENES, the high-resolution optical and near-infrared spectrograph at Calar Alto, and investigate how well the linesFuhrmeister, B. et al.
Fecha de publicación:
12022 -
K2-99 revisited: a non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiantWe report new photometric and spectroscopic observations of the K2-99 planetary system. Asteroseismic analysis of the short-cadence light curve from K2's Campaign 17 allows us to refine the stellar properties. We find K2-99 to be significantly smaller than previously thought, with R ⋆ = 2.55 ± 0.02 R ⊙. The new light curve also contains fourSmith, A. M. S. et al.
Fecha de publicación:
32022 -
The strange case of Na I in the atmosphere of HD 209458 b. Reconciling low- and high-resolution spectroscopic observationsAims: We aim to investigate the origin of the discrepant results reported in the literature about the presence of Na I in the atmosphere of HD 209458 b, based on low- and high-resolution transmission spectroscopy. Methods: We generated synthetic planetary atmosphere models and we compared them with the transmission light curves and spectra observedMorello, G. et al.
Fecha de publicación:
12022 -
Detection of the tidal deformation of WASP-103b at 3 σ with CHEOPSContext. Ultra-short period planets undergo strong tidal interactions with their host star which lead to planet deformation and orbital tidal decay. Aims: WASP-103b is the exoplanet with the highest expected deformation signature in its transit light curve and one of the shortest expected spiral-in times. Measuring the tidal deformation of theBarros, S. C. C. et al.
Fecha de publicación:
12022 -
Silicon in the dayside atmospheres of two ultra-hot JupitersAtmospheres of highly irradiated gas giant planets host a large variety of atomic and ionic species. Here we observe the thermal emission spectra of the two ultra-hot Jupiters WASP-33b and KELT-20b/MASCARA-2b in the near-infrared wavelength range with CARMENES. Via high-resolution Doppler spectroscopy, we searched for neutral silicon (Si) in theirCont, D. et al.
Fecha de publicación:
12022 -
The Ariel 0.6 - 7.8 μm stellar limb-darkening coefficientsWe provide here tables of stellar limb-darkening coefficients (LDCs) for the Ariel ESA M4 space mission. These tables include LDCs corresponding to different wavelength bins and white bands for the NIRSpec, AIRS-Ch0 and AIRS-Ch1 spectrographs, and those corresponding to the VISPhot, FGS1 and FGS2 photometers. The LDCs are calculated with the open
Fecha de publicación:
42021Bibcode -
TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarfWe report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these
Fecha de publicación:
122021Bibcode -
Rapid contraction of giant planets orbiting the 20-million-year-old star V1298 TauCurrent theories of planetary evolution predict that infant giant planets have large radii and very low densities before they slowly contract to reach their final size after about several hundred million years 1,2. These theoretical expectations remain untested so far as the detection and characterization of very young planets is extremely
Fecha de publicación:
122021Bibcode
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SARA SEAGER: “En 10 años tendremos la capacidad de encontrar vida en un exoplaneta”Fecha de publicación