Detailed chemical compositions of the wide binary HD 80606/80607: Revised stellar properties and constraints on planet formation

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Detailed chemical compositions of the wide binary HD 80606/80607 : Revised stellar properties and constraints on planet formation. / Liu, F.; Yong, D.; Asplund, M.; Feltzing, S.; Mustill, A. J.; Meléndez, J.; Ramírez, I.; Lin, J.

I: Astronomy and Astrophysics, Vol. 614, A138, 01.06.2018.

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TY - JOUR

T1 - Detailed chemical compositions of the wide binary HD 80606/80607

T2 - Astronomy & Astrophysics

AU - Liu, F.

AU - Yong, D.

AU - Asplund, M.

AU - Feltzing, S.

AU - Mustill, A. J.

AU - Meléndez, J.

AU - Ramírez, I.

AU - Lin, J.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Differences in the elemental abundances of planet-hosting stars in binary systems can give important clues and constraints about planet formation and evolution. In this study we performed a high-precision, differential elemental abundance analysis of a wide binary system, HD 80606/80607, based on high-resolution spectra with high signal-to-noise ratio obtained with Keck/HIRES. HD 80606 is known to host a giant planet with the mass of four Jupiters, but no planet has been detected around HD 80607 so far. We determined stellar parameters as well as abundances for 23 elements for these two stars with extremely high precision. Our main results are that (i) we confirmed that the two components share very similar chemical compositions, but HD 80606 is marginally more metal-rich than HD 80607, with an average difference of +0.013 ± 0.002 dex (σ = 0.009 dex); and (ii) there is no obvious trend between abundance differences and condensation temperature. Assuming that this binary formed from material with the same chemical composition, it is difficult to understand how giant planet formation could produce the present-day photospheric abundances of the elements we measure. We cannot exclude the possibility that HD 80606 might have accreted about 2.5 to 5 MEarth material onto its surface, possibly from a planet destabilised by the known highly eccentric giant.

AB - Differences in the elemental abundances of planet-hosting stars in binary systems can give important clues and constraints about planet formation and evolution. In this study we performed a high-precision, differential elemental abundance analysis of a wide binary system, HD 80606/80607, based on high-resolution spectra with high signal-to-noise ratio obtained with Keck/HIRES. HD 80606 is known to host a giant planet with the mass of four Jupiters, but no planet has been detected around HD 80607 so far. We determined stellar parameters as well as abundances for 23 elements for these two stars with extremely high precision. Our main results are that (i) we confirmed that the two components share very similar chemical compositions, but HD 80606 is marginally more metal-rich than HD 80607, with an average difference of +0.013 ± 0.002 dex (σ = 0.009 dex); and (ii) there is no obvious trend between abundance differences and condensation temperature. Assuming that this binary formed from material with the same chemical composition, it is difficult to understand how giant planet formation could produce the present-day photospheric abundances of the elements we measure. We cannot exclude the possibility that HD 80606 might have accreted about 2.5 to 5 MEarth material onto its surface, possibly from a planet destabilised by the known highly eccentric giant.

KW - Binaries: general

KW - Planets and satellites: formation

KW - Stars: abundances

KW - Stars: atmospheres

KW - Stars: individual: HD 80606, HD 80607

UR - http://www.scopus.com/inward/record.url?scp=85049654420&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201832701

DO - 10.1051/0004-6361/201832701

M3 - Article

VL - 614

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 1432-0746

M1 - A138

ER -