25 citations · 44 across the 9 of their papers we have counts for
6 papers · 1 filter
Saturns Are Not Large Neptunes: The effect of removing inflated giants from empirical mass-radius relations
Georgina Dransfield, Valentina Tardugno, Niamh K. O'Sullivan
Empirical mass-radius relations have long been used in exoplanetology to study planet demographics and to predict masses and radii for objects where only one of these is known. Inf…
Using Doppler Imaging to model stellar activity and search for planets around Sun-like stars
Baptiste Klein, Suzanne Aigrain, Michael Cretignier +9
Doppler Imaging (DI) is a well-established technique to map a physical field at a stellar surface from a time series of high-resolution spectra. In this proof-of-concept study, we…
Investigating stellar activity through eight years of Sun-as-a-star observations
Baptiste Klein, Suzanne Aigrain, Michael Cretignier +11
Stellar magnetic activity induces both distortions and Doppler-shifts in the absorption line profiles of Sun-like stars. Those effects produce apparent radial velocity (RV) signals…
TOI-837b is a Young Saturn-sized Exoplanet with a Massive 70 Core
Oscar Barragán, Haochuan Yu, Alix Violet Freckelton +10
We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837b, with an orbital period of 8.32d. Ut…
Modelling stellar variability in archival HARPS data: I -- Rotation and activity properties with multi-dimensional Gaussian Processes
Haochuan Yu, Suzanne Aigrain, Baptiste Klein +4
Although instruments for measuring the radial velocities (RVs) of stars now routinely reach sub-meter per second accuracy, the detection of low-mass planets is still very challengi…
Revisiting K2-233 spectroscopic time-series with multidimensional Gaussian Processes
Oscar Barragán, Edward Gillen, Suzanne Aigrain +7
Detecting planetary signatures in radial velocity time-series of young stars is challenging due to their inherently strong stellar activity. However, it is possible to learn inform…