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A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi.
Nature 2007; 449(7159):189-91Nat

Abstract

After the initial discoveries fifteen years ago, over 200 extrasolar planets have now been detected. Most of them orbit main-sequence stars similar to our Sun, although a few planets orbiting red giant stars have been recently found. When the hydrogen in their cores runs out, main-sequence stars undergo an expansion into red-giant stars. This expansion can modify the orbits of planets and can easily reach and engulf the inner planets. The same will happen to the planets of our Solar System in about five billion years and the fate of the Earth is matter of debate. Here we report the discovery of a planetary-mass body (Msini = 3.2M(Jupiter)) orbiting the star V 391 Pegasi at a distance of about 1.7 astronomical units (au), with a period of 3.2 years. This star is on the extreme horizontal branch of the Hertzsprung-Russell diagram, burning helium in its core and pulsating. The maximum radius of the red-giant precursor of V 391 Pegasi may have reached 0.7 au, while the orbital distance of the planet during the stellar main-sequence phase is estimated to be about 1 au. This detection of a planet orbiting a post-red-giant star demonstrates that planets with orbital distances of less than 2 au can survive the red-giant expansion of their parent stars.

Authors+Show Affiliations

INAF-Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy. silvotti@na.astro.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

17851517

Citation

Silvotti, R, et al. "A Giant Planet Orbiting the 'extreme Horizontal Branch' Star V 391 Pegasi." Nature, vol. 449, no. 7159, 2007, pp. 189-91.
Silvotti R, Schuh S, Janulis R, et al. A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi. Nature. 2007;449(7159):189-91.
Silvotti, R., Schuh, S., Janulis, R., Solheim, J. E., Bernabei, S., Østensen, R., ... Zola, S. (2007). A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi. Nature, 449(7159), pp. 189-91.
Silvotti R, et al. A Giant Planet Orbiting the 'extreme Horizontal Branch' Star V 391 Pegasi. Nature. 2007 Sep 13;449(7159):189-91. PubMed PMID: 17851517.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi. AU - Silvotti,R, AU - Schuh,S, AU - Janulis,R, AU - Solheim,J-E, AU - Bernabei,S, AU - Østensen,R, AU - Oswalt,T D, AU - Bruni,I, AU - Gualandi,R, AU - Bonanno,A, AU - Vauclair,G, AU - Reed,M, AU - Chen,C-W, AU - Leibowitz,E, AU - Paparo,M, AU - Baran,A, AU - Charpinet,S, AU - Dolez,N, AU - Kawaler,S, AU - Kurtz,D, AU - Moskalik,P, AU - Riddle,R, AU - Zola,S, PY - 2007/04/06/received PY - 2007/07/26/accepted PY - 2007/9/14/pubmed PY - 2007/9/14/medline PY - 2007/9/14/entrez SP - 189 EP - 91 JF - Nature JO - Nature VL - 449 IS - 7159 N2 - After the initial discoveries fifteen years ago, over 200 extrasolar planets have now been detected. Most of them orbit main-sequence stars similar to our Sun, although a few planets orbiting red giant stars have been recently found. When the hydrogen in their cores runs out, main-sequence stars undergo an expansion into red-giant stars. This expansion can modify the orbits of planets and can easily reach and engulf the inner planets. The same will happen to the planets of our Solar System in about five billion years and the fate of the Earth is matter of debate. Here we report the discovery of a planetary-mass body (Msini = 3.2M(Jupiter)) orbiting the star V 391 Pegasi at a distance of about 1.7 astronomical units (au), with a period of 3.2 years. This star is on the extreme horizontal branch of the Hertzsprung-Russell diagram, burning helium in its core and pulsating. The maximum radius of the red-giant precursor of V 391 Pegasi may have reached 0.7 au, while the orbital distance of the planet during the stellar main-sequence phase is estimated to be about 1 au. This detection of a planet orbiting a post-red-giant star demonstrates that planets with orbital distances of less than 2 au can survive the red-giant expansion of their parent stars. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/17851517/A_giant_planet_orbiting_the_'extreme_horizontal_branch'_star_V_391_Pegasi_ L2 - https://doi.org/10.1038/nature06143 DB - PRIME DP - Unbound Medicine ER -