Rotation Periods of TESS Objects of Interest from the Magellan-TESS Survey with Multiband Photometry from Evryscope and TESS

Howard, W.S.
Teske, J.
Corbett, H.
Law, N.M.
Wang, S.X.
Ratzloff, J.K.
Galliher, N.W.
Gonzalez, R.
Soto, A.V.
Glazier, A.L
Haislip, J.

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Publication date

January 2021

DOI

10.17615/sdjv-e991

Publisher

American Astronomical Society

Abstract

Stellar radial-velocity (RV) jitter due to surface activity may bias the RV semiamplitude and mass of rocky planets. The amplitude of the jitter may be estimated from the uncertainty in the rotation period, allowing the mass to be more accurately obtained. We find candidate rotation periods for 17 out of 35 TESS Objects of Interest (TOI) hosting <3 R ⊕ planets as part of the Magellan-TESS survey, which is the first-ever statistically robust study of exoplanet masses and radii across the photoevaporation gap. Seven periods are ≥3σ detections, two are ≥1.5σ, and eight show plausible variability, but the periods remain unconfirmed. The other 18 TOIs are nondetections. Candidate rotators include the host stars of the confirmed planets L 168-9 b...