10.5281/zenodo.4564832
https://zenodo.org/records/4564832
oai:zenodo.org:4564832
Stefano Bellotti
Stefano Bellotti
0000-0002-2558-6920
IRAP
Julien Morin
Julien Morin
0000-0002-4996-6901
LUPM
Pascal Petit
Pascal Petit
0000-0001-7624-9222
IRAP
Gaitee Hussain
Gaitee Hussain
0000-0003-3547-3783
ESA/ESTEC
Spectropolarimetry in optical and near-IR for EV Lac and AD Leo: what is stellar activity's favourite colour?
Zenodo
2021
Cool Stars on the main sequence
stellar activity
radial velocity
spectropolarimetry
2021-02-26
Poster
10.5281/zenodo.4564831
https://zenodo.org/communities/coolstars20half
Creative Commons Attribution 4.0 International
Stellar activity hinders the detection of small exoplanets with the radial velocity (RV) method, because it introduces spurious signals that can drown or mimic planetary signatures. It is therefore crucial to understand and filter out activity signals, especially in light of future small planet searches.
We investigate ways to reduce activity jitter in RV time series using spectropolarimetric data sets in optical (ESPaDOnS@CHFT and NARVAL@TBL), and in near-infrared (nIR) with SPIRou@CHFT. We employ two approaches: 1) perform a chromatic study of typical stellar activity proxies, and 2) study a parametric selection of spectral lines to build a mask for Least-Square Deconvolution. The study is performed for EV Lac and AD Leo, two very active M dwarfs.