{"id":4547,"date":"2024-06-28T10:54:53","date_gmt":"2024-06-28T08:54:53","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/en\/?p=4547"},"modified":"2024-06-28T10:54:53","modified_gmt":"2024-06-28T08:54:53","slug":"bd-14-3065b-toi-4987b-from-giant-planet-to-brown-dwarf-evidence-for-deuterium-burning-in-old-age","status":"publish","type":"post","link":"https:\/\/stel.asu.cas.cz\/en\/2024\/06\/28\/bd-14-3065b-toi-4987b-from-giant-planet-to-brown-dwarf-evidence-for-deuterium-burning-in-old-age\/","title":{"rendered":"BD-14 3065b (TOI-4987b) &#8211; from giant planet to brown dwarf: evidence for deuterium burning in old age?"},"content":{"rendered":"\n<p>The exoplanet\/brown dwarf BD-14 3065b has an unexpectedly large radius for its age, suggesting that it is burning deuterium. This is the process that distinguishes brown dwarfs from exoplanets.<\/p>\n\n\n\n<p>Dr J\u00e1n \u0160ubjak from the Stellar Department of the Astronomical Institute of the Czech Academy of Sciences, lead author of the study accepted for publication in the journal Astronomy &amp; Astrophysics, explains the details of his work.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Abstract<\/h4>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>The present study reports the confirmation of BD-14 3065b, a transiting planet\/brown dwarf in a triple-star system, with a mass near the deuterium burning boundary. BD-14 3065b has the largest radius observed within the sample of giant planets and brown dwarfs around post-main-sequence stars. Its orbital period is 4.3 days, and it transits a subgiant F-type star with a mass of M\u22c6=1.41\u00b10.05M\u2299, a radius of R\u22c6=2.35\u00b10.08R\u2299, an effective temperature of Teff=6935\u00b190 K, and a metallicity of \u22120.34\u00b10.05 dex. By combining TESS photometry with high-resolution spectra acquired with the TRES and Pucheros+ spectrographs, we measured a mass of Mp=12.37\u00b10.92MJ and a radius of Rp=1.926\u00b10.094RJ. Our discussion of potential processes that could be responsible for the inflated radius led us to conclude that deuterium burning is a plausible explanation resulting from the heating of BD-14 3065b&#8217;s interior. Detection of the secondary eclipse with TESS photometry enables a precise determination of the eccentricity ep=0.066\u00b10.011 and reveals BD-14 3065b has a brightness temperature of 3520\u00b1130 K. With its unique characteristics, BD-14 3065b presents an excellent opportunity to study its atmosphere through thermal emission spectroscopy.<\/p>\n<\/blockquote>\n\n\n\n<p><a href=\"https:\/\/www.asu.cas.cz\/articles\/2291\/19\/cesti-vedci-objevili-hnedeho-trpaslika-ktery-byl-jeste-nedavno-exoplanetou\" target=\"_blank\" rel=\"noreferrer noopener\">Article on ASU web page<\/a> &#8211; in Czech<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">More informations and contacts<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.asu.cas.cz\/files\/articles\/2024\/02291-cesti-vedci-objevili-hnedeho-trpaslika\/tz-trpaslik.docx\" target=\"_blank\" rel=\"noreferrer noopener\">Press Release ASU<\/a> &#8211; in Czech <\/li>\n\n\n\n<li>Scientific paper: <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2024arXiv240312311S\/abstract\" target=\"_blank\" rel=\"noreferrer noopener\">2024arXiv240312311S\/abstract<\/a>; <a href=\"https:\/\/arxiv.org\/abs\/2403.12311\" target=\"_blank\" rel=\"noreferrer noopener\">arxiv.org\/abs\/2403.12311<\/a><\/li>\n\n\n\n<li>Dr. J\u00e1n \u0160ubjak \u2013\u00a0Astronomical Institute CR, Stellar department,\u00a0jan.subjak@asu.cas.cz<\/li>\n\n\n\n<li>Pavel Suchan \u2013\u00a0Press Secretary, AI CR,\u00a0suchan@astro.cz,\u00a0+420 737 322 815<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The exoplanet\/brown dwarf BD-14 3065b has an unexpectedly large radius for its age, suggesting that it is burning deuterium. This is the process that distinguishes<\/p>\n","protected":false},"author":1,"featured_media":4550,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40,35],"tags":[],"class_list":["post-4547","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exoplanet","category-news"],"_links":{"self":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts\/4547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/comments?post=4547"}],"version-history":[{"count":3,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts\/4547\/revisions"}],"predecessor-version":[{"id":4551,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts\/4547\/revisions\/4551"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/media\/4550"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/media?parent=4547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/categories?post=4547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/tags?post=4547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}