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Astrophysics > Earth and Planetary Astrophysics

Title:Simulated mass measurements of the young planet K2-33b

Abstract: In this paper, we carry out simulations of radial velocity (RV) measurements of the mass of the 8-11 Myr Neptune-sized planet K2-33b using high-precision near infrared velocimeters like SPIRou at the Canada-France-Hawaii Telescope. We generate a RV curve containing a planet signature and a realistic stellar activity signal, computed for a central wavelength of 1.8 $\mu$m and statistically compatible with the light-curve obtained with K2. The modelled activity signal includes the effect of time-evolving dark and bright surface features hosting a 2 kG radial magnetic field, resulting in a RV signal of semi-amplitude ~30 m/s. Assuming a 3-month visibility window, we build RV time-series including Gaussian white noise from which we retrieve the planet mass while filtering the stellar activity signal using Gaussian Process Regression. We find that 35/50 visits spread over 3 consecutive bright-time runs on K2-33 allow one to reliably detect planet RV signatures of respectively 10 and 5 m/s at precisions larger than 3 $\sigma$. We also show that 30 visits may end up being insufficient in some cases to provide a good coverage of the stellar rotation cycle, with the result that the planet signature can go undetected or the mass estimation be plagued by large errors.
Comments: Letter accepted in MNRAS, 6 pages, 3 figures
DOI: 10.1093/mnrasl/slaa009
Report number: MN-19-3754-L
Cite as: arXiv:2001.04304 [astro-ph.EP]
  (or arXiv:2001.04304v1 [astro-ph.EP] for this version)

Submission history

From: Baptiste Klein [view email]
[v1] Mon, 13 Jan 2020 14:44:10 UTC (839 KB)
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