UV lines as a tracers for the XUV-fluxes of stars and the PLATOspec project

Abstract

Observations in the UV-regime are very important for exoplanet research, because many diagnostically important lines for studying stellar activity are in this regime. Studying stellar activity is not only important because of its negative effects on the determination planetary parameters, but also because the XUV-radiation from the host stars affects the photochemistry and the erosion of planetary atmospheres . Unfortunately, the XUV-region is only accessible from space. However, since the XUV-radiation is correlated with the CaII,HK-lines, we can use these lines to study the XUV radiation indirectly. The CaIIHK lines for relatively bright stars can be observed with PLATOspec, a new high-resolution echelle spectrograph in development for the ESO 1.5m telescope at La Silla. One advantage compared to instruments on larger telescopes will be that large programs can be carried out. There will be two modes for obtaining precise RV-measurements. In the future, the CUBES instrument on the VLT will be able to study the same lines to probe the XUV-radiation in much fainter targets.

arXiv comment9 pages, 3 figures

References in corpus (14)

• X-ray astronomy of stellar coronae (Review)
• WASP-12b: The hottest transiting planet yet discovered
• WASP-121 b: a hot Jupiter in a polar orbit and close to tidal disruption
• Origin and Loss of nebula-captured hydrogen envelopes from "sub"- to "super-Earths" in the habitable zone of Sun-like stars
• Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum
• WASP-107b's density is even lower: a case study for the physics of planetary gas envelope accretion and orbital migration
• Disentangling degenerate solutions from primary transit and secondary eclipse spectroscopy of exoplanets
• Characterisation of the radial velocity signal induced by rotation in late-type dwarfs
• The CARMENES search for exoplanets around M dwarfs -- LP 714-47b (TOI 442.01): Populating the Neptune desert
• The Discovery of Stellar Oscillations in the Planet Hosting Giant Star Beta Geminorum
• The UV surface habitability of Proxima b: first experiments revealing probable life survival to stellar flares
• The CARMENES search for exoplanets around M dwarfs: Wing asymmetries of H$\alpha$, Na I D, and He I lines
• The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b
• Precision stellar radial velocity measurements with FIDEOS at the ESO 1-m telescope of La Silla