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

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  <identifier identifierType="DOI">10.5281/zenodo.4564832</identifier>
      <creatorName>Stefano Bellotti</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0002-2558-6920</nameIdentifier>
      <creatorName>Julien Morin</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0002-4996-6901</nameIdentifier>
      <creatorName>Pascal Petit</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0001-7624-9222</nameIdentifier>
      <creatorName>Gaitee Hussain</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0003-3547-3783</nameIdentifier>
    <title>Spectropolarimetry in optical and near-IR for EV Lac and AD Leo: what is stellar activity's favourite colour?</title>
    <subject>Cool Stars on the main sequence</subject>
    <subject>stellar activity</subject>
    <subject>radial velocity</subject>
    <date dateType="Issued">2021-02-26</date>
  <resourceType resourceTypeGeneral="Text">Poster</resourceType>
    <alternateIdentifier alternateIdentifierType="url"></alternateIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.4564831</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf"></relatedIdentifier>
    <rights rightsURI="">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">&lt;p&gt;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.&lt;/p&gt;

&lt;p&gt;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&amp;nbsp; 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.&lt;/p&gt;</description>
    <description descriptionType="Other">{"references": ["Queloz et al. 2001, A&amp;A, 379, 279-287", "Huelamo et al. 2008, A&amp;A, 2, L9-L13", "Donati et al. 1997, MNRAS, 291, 658", "Boisse et al. 2009, A&amp;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 &amp; K\u00fcrster 2009, A&amp;A, 496, 577-584"]}</description>
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