Poster Open Access
Probing exosphere of Neptune size planets around M-dwarf using He10830
Joe Ninan;
Gudmundur Stefansson;
Suvrath Mahadevan;
Chad Bender;
Paul Robertson;
Ryan Terrien;
HPF Team
Recently, resonant scattering absorption of meta-stable Helium atoms at 10830 Angstroms has been identified as a powerful probe to detect the extended exospheres from exoplanets. This near-infrared line is observable from the ground and unaffected by the interstellar medium, and has numerous advantages over conventional Ly alpha. The high spectral resolution observations of these meta-stable helium atoms from the exospheres enable us to study the irradiation environment as well as the structure of the outflow from the evaporating atmospheres in M-dwarf planets. In this poster we present our first detection of He10830 in the exosphere of a warm Neptune orbiting an M-dwarf, GJ 3470, using the Habitable-Zone Planet Finder (HPF). We also present our analysis of the outflow structure via line profile analysis, and the EUV irradiation environment on the planet from this detection.
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- Publication date:
- February 26, 2021
- DOI:
-
- Keyword(s):
- Exoplanets around cool stars Evaporating atmospheres
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International