Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-09
Astrophys.J. 641 (2006) L133-L136
Astronomy and Astrophysics
Astrophysics
minor changes reflect published version (2006 April 20)
Scientific paper
10.1086/503898
Despite the observational effort carried out in the last few decades, no perfect solar twin has been found to date. An important milestone was achieved a decade ago by Porto de Mello & da Silva, who showed that 18 Sco is almost a solar twin. In the present work, we use extremely high resolution (R = 10^5) high S/N Keck HIRES spectra to carry out a differential analysis of 16 solar twin candidates. We show that HD 98618 is the second-closest solar twin and that the fundamental parameters of both HD 98618 and 18 Sco are very similar (within a few percent) to the host star of our solar system, including the likelihood of hosting a terrestrial planet within their habitable zone. We suggest that these stars should be given top priority in exoplanet and SETI surveys.
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Caltech
Dodds-Eden Katie
Melendez Jorge
Observatory RSAA/Mt Stromlo
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