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J/A+A/614/A138      HD 80606/80607 equivalent widths                (Lui+, 2018)

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., Melendez J., Ramirez I., Lin J. <Astron. Astrophys. 614, A138 (2018)> =2018A&A...614A.138L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Exoplanets ; Equivalent widths Keywords: planets and satellites: formation - binaries: general - stars: abundances - stars: atmospheres - stars: individual: HD 80606, HD 80607 Abstract: 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±0.002dex (σ=0.009dex); 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 5MEarth material onto its surface, possibly from a planet destabilised by the known highly eccentric giant. Description: We obtained high-resolution (R=86000) spectra of HD 80606/80607 using the 0.4" slit and 'kv408' filter of the High Resolution Echelle Spectrometer (HIRES) on the 10m Keck I telescope on 1 November 2015. The spectral wavelength coverage is almost complete from 420 to 860nm. Atomic line data, as well as the equivalent width measurements, adopted for our analysis. Objects: ------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------ 09 22 37.58 +50 36 13.4 HD 80606 = HIP 45982 09 22 39.74 +50 36 13.9 HD 80607 = HIP 45983 ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 54 245 Atomic line data, as well as the EW measurements, adopted for our analysis
See also: J/A+A/516/A95 : Photometry and spectroscopy of HD 80606b (Hebrard+, 2010) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm lambda Wavelength (Angstrom) 12- 15 A4 --- Species Species 19- 22 F4.2 eV Ep Lower excitation potential (eV) 26- 30 F5.2 [-] loggf Oscillator strength (loggf) 34- 38 F5.1 10-4nm EW1 Equivalent widths for Vesta (mÅ) 42- 46 F5.1 10-4nm EW2 Equivalent widths for HD 80606 (mÅ) 50- 54 F5.1 10-4nm EW3 Equivalent widths for HD 80607 (mÅ)
Acknowledgements: Fan Liu, fan.liu(at)
(End) Patricia Vannier [CDS] 05-Mar-2018
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