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                <term xml:lang="en">PDS 70</term>
                <term xml:lang="en">Planetary systems</term>
                <term xml:lang="en">Imaging spectroscopy</term>
                <term xml:lang="en">Data analysis</term>
                <term xml:lang="en">Spectrograph</term>
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              <p>Context. PDS 70 is a young (5.4 Myr), nearby (~113 pc) star hosting a known transition disk with a large gap. Recent observations with SPHERE and NACO in the near-infrared (NIR) allowed us to detect a planetary mass companion, PDS 70 b, within the disk cavity. Moreover, observations in Hα with MagAO and MUSE revealed emission associated to PDS 70 b and to another new companion candidate, PDS 70 c, at a larger separation from the star. PDS 70 is the only multiple planetary system at its formation stage detected so far through direct imaging.Aims. Our aim is to confirm the discovery of the second planet PDS 70 c using SPHERE at VLT, to further characterize its physical properties, and search for additional point sources in this young planetary system.Methods. We re-analyzed archival SPHERE NIR observations and obtained new data in Y, J, H and K spectral bands for a total of four different epochs. The data were reduced using the data reduction and handling pipeline and the SPHERE data center. We then applied custom routines (e.g., ANDROMEDA and PACO) to subtract the starlight.Results. We re-detect both PDS 70 b and c and confirm that PDS 70 c is gravitationally bound to the star. We estimate this second planet to be less massive than 5 MJup and with a Teff around 900 K. Also, it has a low gravity with logg between 3.0 and 3.5 dex. In addition, a third object has been identified at short separation (~0.12′′) from the star and gravitationally bound to the star. Its spectrum is however very blue, meaning that we are probably seeing stellar light reflected by dust and our analysis seems to demonstrate that it is a feature of the inner disk. We cannot however completely exclude the possibility that it is a planetary mass object enshrouded by a dust envelope. In this latter case, its mass should be of the order of a few tens of M⊕. Moreover, we propose a possible structure for the planetary system based on our data, and find that this structure cannot be stable on a long timescale.</p>
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            <ref type="url">https://www.univ-st-etienne.fr/fr/index.html</ref>
          </desc>
        </org>
        <org type="regroupinstitution" xml:id="struct-121723" status="VALID">
          <idno type="ROR">https://ror.org/027bh9e22</idno>
          <orgName>Universiteit Leiden = Leiden University</orgName>
          <desc>
            <address>
              <addrLine>Leiden University | 2300 RA Leiden The Netherlands</addrLine>
              <country key="NL"/>
            </address>
            <ref type="url">https://www.universiteitleiden.nl/en/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-92863" status="VALID">
          <idno type="IdRef">026431297</idno>
          <idno type="ROR">https://ror.org/02495e989</idno>
          <orgName>Université Catholique de Louvain = Catholic University of Louvain</orgName>
          <orgName type="acronym">UCLouvain</orgName>
          <desc>
            <address>
              <addrLine>Place de l'Université 1, B-1348 Louvain-La-Neuve</addrLine>
              <country key="BE"/>
            </address>
            <ref type="url">https://www.uclouvain.be/fr</ref>
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        </org>
        <org type="institution" xml:id="struct-154620" status="VALID">
          <idno type="ROR">https://ror.org/01swzsf04</idno>
          <orgName>Université de Genève = University of Geneva</orgName>
          <orgName type="acronym">UNIGE</orgName>
          <date type="start">1559-01-01</date>
          <desc>
            <address>
              <addrLine>24 rue du Général-Dufour CH - 1211 Genève 4Suisse</addrLine>
              <country key="CH"/>
            </address>
            <ref type="url">http://www.unige.ch/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300563" status="VALID">
          <idno type="IdRef">026591790</idno>
          <idno type="ROR">https://ror.org/05f0yaq80</idno>
          <orgName>Stockholm University</orgName>
          <desc>
            <address>
              <addrLine>SE-106 91 Stockholm</addrLine>
              <country key="SE"/>
            </address>
            <ref type="url">http://www.su.se/english/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-557826" status="VALID">
          <idno type="IdRef">236453505</idno>
          <idno type="ISNI">0000 0004 7885 7602</idno>
          <idno type="ROR">https://ror.org/05f82e368</idno>
          <orgName>Université Paris Cité</orgName>
          <orgName type="acronym">UPCité</orgName>
          <date type="start">2020-01-01</date>
          <desc>
            <address>
              <addrLine>85 boulevard Saint-Germain75006 Paris</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://u-paris.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-117617" status="VALID">
          <idno type="IdRef">026403498</idno>
          <idno type="ISNI">0000000123372892</idno>
          <idno type="ROR">https://ror.org/02k9vew78</idno>
          <orgName>Université Nice Sophia Antipolis (1965 - 2019)</orgName>
          <orgName type="acronym">UNS</orgName>
          <date type="start">1965-10-23</date>
          <date type="end">2019-12-31</date>
          <desc>
            <address>
              <addrLine>Parc Valrose, 06100 Nice</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://unice.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-302144" status="VALID">
          <orgName>Observatoire de la Côte d'Azur</orgName>
          <desc>
            <address>
              <country key="FR"/>
            </address>
          </desc>
          <listRelation>
            <relation active="#struct-1039632" type="direct"/>
          </listRelation>
        </org>
        <org type="institution" xml:id="struct-300024" status="VALID">
          <idno type="ROR">https://ror.org/005y2ap84</idno>
          <orgName>ONERA</orgName>
          <desc>
            <address>
              <addrLine>Office National d’Études et de Recherches Aéronautiques29, avenue de la Division Leclerc - BP 72 - 92322 CHATILLON CEDEX</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.onera.fr/fr</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-562112" status="OLD">
          <orgName>Université Paris Saclay (COmUE)</orgName>
          <desc>
            <address>
              <addrLine>Espace Technologique, Bât. Discovery - RD 128 - 2è ététage, 91190 Saint-Aubin</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.universite-paris-saclay.fr/fr</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300666" status="VALID">
          <idno type="ROR">https://ror.org/01ryk1543</idno>
          <orgName>University of Southampton</orgName>
          <desc>
            <address>
              <addrLine>University Road, Southampton SO17 1BJ</addrLine>
              <country key="GB"/>
            </address>
            <ref type="url">http://www.southampton.ac.uk/</ref>
          </desc>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>