Using near-infrared spectroscopy for characterization of transiting exoplanets
2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 578, A133Article in journal (Refereed) Published
Context. We propose a method for observing transiting exoplanets with near-infrared high-resolution spectrometers. Aims. We aim to create a robust data analysis method for recovering atmospheric transmission spectra from transiting exoplanets over a wide wavelength range in the near-infrared. Methods. By using an inverse method approach, combined with stellar models and telluric transmission spectra, the method recovers the transiting exoplanet's atmospheric transmittance at high precision over a wide wavelength range. We describe our method and have tested it by simulating observations. Results. This method is capable of recovering transmission spectra of high enough accuracy to identify absorption features from molecules such as O-2, CH4, CO2, and H2O. This accuracy is achievable for Jupiter-size exoplanets at S/N that can be reached for 8m class telescopes using high-resolution spectrometers (R > 20 000) during a single transit, and for Earth-size planets and super-Earths transiting late K or M dwarf stars at S/N reachable during observations of less than 10 transits. We also analyse potential error sources to show the robustness of the method. Conclusions. Detection and characterization of atmospheres of both Jupiter-size planets and smaller rocky planets looks promising using this set-up.
Place, publisher, year, edition, pages
2015. Vol. 578, A133
methods: data analysis, techniques: spectroscopic, planets and satellites: atmospheres, infrared: planetary systems
IdentifiersURN: urn:nbn:se:uu:diva-267518DOI: 10.1051/0004-6361/201424058ISI: 000357502600145OAI: oai:DiVA.org:uu-267518DiVA: diva2:873408
Correction in: Astronomy and Astrophysics, 2015, Volume: 581, Article Number: C1, DOI: 10.1051/0004-6361/201424058e2015-11-242015-11-242015-11-24Bibliographically approved