2016ApJ...818...54M


Query : 2016ApJ...818...54M

2016ApJ...818...54M - Astrophys. J., 818, 54 (2016/February-2)

Detailed abundances of planet-hosting wide binaries. II. HD80606+HD80607.

MACK III C.E., STASSUN K.G., SCHULER S.C., HEBB L. and PEPPER J.A.

Abstract (from CDS):

We present a detailed chemical abundance analysis of 15 elements in the planet-hosting wide binary (PHWB) system HD 80606+HD 80607 using Keck/HIRES spectra. As in our previous analysis of the PHWB HD 20782+HD 20781, we presume that these two G5 dwarf stars formed together and therefore had identical primordial abundances. In this binary, HD 80606 hosts an eccentric (e ≈ 0.93) giant planet at ∼0.5 AU, but HD 80607 has no detected planets. If close-in giant planets on eccentric orbits are efficient at scattering rocky planetary material into their host stars, then HD 80606 should show evidence of having accreted rocky material while HD 80607 should not. Here we show that the trends of abundance versus element condensation temperature for HD 80606 and HD 80607 are statistically indistinguishable, corroborating the recent result of Saffe et al. This could suggest that both stars accreted similar amounts of rocky material; indeed, our model for the chemical signature of rocky planet accretion indicates that HD 80606 could have accreted up to 2.5 M of rocky material–about half that contained in the Solar System and primordial asteroid belt–relative to HD 80607 and still be consistent with the data. Since HD 80607 has no known giant planets that might have pushed rocky planet material via migration onto that star, we consider it more likely that HD 80606/07 experienced essentially no rocky planet accretion. This in turn suggests that the migration history of the HD 80606 giant planet must have been such that it ejected any close-in planetary material that might have otherwise been shepherded onto the star.

Abstract Copyright:

Journal keyword(s): binaries: visual - planetary systems - stars: abundances - stars: individual: (HD 80606, HD 80607)

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 20781 PM* 03 20 02.9428582501 -28 47 01.790465531   9.263 8.44 8.17 8.43 G9.5V 92 1
2 HD 20782 PM* 03 20 03.5777409770 -28 51 14.660409684   8.03 7.38     G1.5V 171 1
3 BD+50 1471 PM* 07 48 06.4723053776 +50 13 32.920598923   12.002 11.138 10.669 10.243 G9V 146 1
4 BD+50 1471B PM* 07 48 07.4814105508 +50 13 03.255439301   11.927 11.086 10.631 10.216 G9V 45 0
5 HD 80606 PM* 09 22 37.5769478105 +50 36 13.434928660   9.78 9.00     G8V 293 2
6 HD 80606b Pl 09 22 37.5769478105 +50 36 13.434928660           ~ 287 1
7 HD 80607 PM* 09 22 39.7367015092 +50 36 13.952617706   9.937 9.070     G5 85 2
8 BD+41 3306 PM* 19 19 00.5488384064 +41 38 04.581624991 10.01 9.67 8.86 8.18 7.66 K0V 236 0
9 * 16 Cyg A ** 19 41 48.9539315338 +50 31 30.218780803 6.79 6.59 5.95 5.50 5.17 G1.5Vb 695 1
10 * 16 Cyg ** 19 41 49.09 +50 31 31.6           ~ 127 0
11 * 16 Cyg B PM* 19 41 51.9731830550 +50 31 03.086127222 7.07 6.86 6.20 5.76 5.42 G3V 817 1
12 BD+37 4734B PM* 22 57 46.8443014981 +38 40 30.355384717   10.82 9.87     G0V 147 1

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2021.09.17-17:30:44

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