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55 Cancri: Stellar Astrophysical Parameters, a Planet in the Habitable Zone, and Implications for the Radius of a Transiting Super-Earth

dc.contributor.authorVON BRAUN, Kaspar
dc.contributor.authorBOYAJIAN, Tabetha S.
dc.contributor.authorBRUMMELAAR, Theo A. Ten
dc.contributor.authorKANE, Stephen R.
dc.contributor.authorVAN BELLE, Gerard T.
dc.contributor.authorCIARDI, David R.
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorRAYMOND, Sean N.
dc.contributor.authorLOPEZ-MORALES, Mercedes
dc.contributor.authorMCALISTER, Harold A.
dc.contributor.authorSCHAEFER, Gail
dc.contributor.authorRIDGWAY, Stephen T.
hal.structure.identifierCHARA (Center for High Angular Resolution Astronomy) Array
dc.contributor.authorSTURMANN, Laszlo
hal.structure.identifierCHARA (Center for High Angular Resolution Astronomy) Array
dc.contributor.authorSTURMANN, Judit
dc.contributor.authorWHITE, Russel
dc.contributor.authorTURNER, Nils H.
dc.contributor.authorFARRINGTON, Chris
hal.structure.identifierCHARA (Center for High Angular Resolution Astronomy) Array
dc.contributor.authorGOLDFINGER, P. J.
dc.date.created2011-07-22
dc.date.issued2011
dc.identifier.issn0004-637X
dc.description.abstractEnThe bright star 55 Cancri is known to host five planets, including a transiting super-Earth. The study presented here yields directly determined values for 55 Cnc's stellar astrophysical parameters based on improved interferometry: $R=0.943 \pm 0.010 R_{\odot}$, $T_{\rm EFF} = 5196 \pm 24$ K. We use isochrone fitting to determine 55 Cnc's age to be 10.2 $\pm$ 2.5 Gyr, implying a stellar mass of $0.905 \pm 0.015 M_{\odot}$. Our analysis of the location and extent of the system's habitable zone (0.67--1.32 AU) shows that planet f, with period $\sim$ 260 days and $M \sin i = 0.155 M_{Jupiter}$, spends the majority of the duration of its elliptical orbit in the circumstellar habitable zone. Though planet f is too massive to harbor liquid water on any planetary surface, we elaborate on the potential of alternative low-mass objects in planet f's vicinity: a large moon, and a low-mass planet on a dynamically stable orbit within the habitable zone. Finally, our direct value for 55 Cancri's stellar radius allows for a model-independent calculation of the physical diameter of the transiting super-Earth 55 Cnc e ($\sim 2.05 \pm 0.15 R_{\earth}$), which, depending on the planetary mass assumed, implies a bulk density of 0.76 $\rho_{\earth}$ or 1.07 $\rho_{\earth}$.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.title.en55 Cancri: Stellar Astrophysical Parameters, a Planet in the Habitable Zone, and Implications for the Radius of a Transiting Super-Earth
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/740/1/49
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1106.1152
bordeaux.journalThe Astrophysical Journal
bordeaux.pageid49
bordeaux.volume740
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00622284
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00622284v1
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