Poster Open Access
Spectropolarimetry in optical and near-IR for EV Lac and AD Leo: what is stellar activity's favourite colour?
Stefano Bellotti;
Julien Morin;
Pascal Petit;
Gaitee Hussain
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.
| Name | Size | |
|---|---|---|
|
bellotti_coolstars205.pdf
md5:0b7e9bc0b01d15b28151def56578a105 |
891.2 kB | Download |
Queloz et al. 2001, A&A, 379, 279-287
Huelamo et al. 2008, A&A, 2, L9-L13
Donati et al. 1997, MNRAS, 291, 658
Boisse et al. 2009, A&A, 495, 959-966
Donati et al. 2016, Nature, 7609, 662-666
Hebrard et al. 2016, MNRAS, 461, 1465-1497
Haywood et al. 2014, MNRAS, 443, 2517-2531
Zechmeister & Kürster 2009, A&A, 496, 577-584
| All versions | This version | |
|---|---|---|
| Views | 143 | 143 |
| Downloads | 108 | 108 |
| Data volume | 96.2 MB | 96.2 MB |
| Unique views | 132 | 132 |
| Unique downloads | 104 | 104 |
- Publication date:
- February 26, 2021
- DOI:
-
- Keyword(s):
- Cool Stars on the main sequence stellar activity radial velocity spectropolarimetry
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International