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dc.contributor.authorDumusque, Xavier
dc.contributor.authorGlenday, Alex
dc.contributor.authorPhillips, David F.
dc.contributor.authorBuchschacher, Nicolas
dc.contributor.authorCameron, Andrew Collier
dc.contributor.authorCecconi, Massimo
dc.contributor.authorCharbonneau, David
dc.contributor.authorCosentino, Rosario
dc.contributor.authorGhedina, Adriano
dc.contributor.authorLatham, David Winslow
dc.contributor.authorLi, Chih-Hao
dc.contributor.authorLodi, Marcello
dc.contributor.authorLovis, Christophe
dc.contributor.authorMolinari, Emilio
dc.contributor.authorPepe, Francesco
dc.contributor.authorUdry, Stéphane
dc.contributor.authorSasselov, Dimitar D.
dc.contributor.authorSzentgyorgyi, Andrew H.
dc.contributor.authorWalsworth, Ronald Lee
dc.date.accessioned2016-07-20T16:53:32Z
dc.date.issued2015
dc.identifier.citationDumusque, Xavier, Alex Glenday, David F. Phillips, Nicolas Buchschacher, Andrew Collier Cameron, Massimo Cecconi, David Charbonneau, et al. 2015. “HARPS-N Observes the Sun as a Star” The Astrophysical Journal 814 (2) (November 21): L21. doi:10.1088/2041-8205/814/2/l21.en_US
dc.identifier.issn2041-8213en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:27708804
dc.description.abstractRadial velocity (RV) perturbations induced by stellar surface inhomogeneities including spots, plages and granules currently limit the detection of Earth-twins using Doppler spectroscopy. Such stellar noise is poorly understood for stars other than the Sun because their surface is unresolved. In particular, the effects of stellar surface inhomogeneities on observed stellar radial velocities are extremely difficult to characterize, and thus developing optimal correction techniques to extract true stellar radial velocities is extremely challenging. In this paper, we present preliminary results of a solar telescope built to feed full-disk sunlight into the HARPS-N spectrograph, which is in turn calibrated with an astro-comb. This setup enables long-term observation of the Sun as a star with state-of-the-art sensitivity to RV changes. Over seven days of observing in 2014, we show an average 50 cm s−1 RV rms over a few hours of observation. After correcting observed radial velocities for spot and plage perturbations using full-disk photometry of the Sun, we lower by a factor of two the weekly RV rms to 60 cm s−1. The solar telescope is now entering routine operation, and will observe the Sun every clear day for several hours. We will use these radial velocities combined with data from solar satellites to improve our understanding of stellar noise and develop optimal correction methods. If successful, these new methods should enable the detection of Venus over the next two to three years, thus demonstrating the possibility of detecting Earth-twins around other solar-like stars using the RV technique.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofdoi:10.1088/2041-8205/814/2/L21en_US
dash.licenseLAA
dc.subjectinstrumentation: spectrographsen_US
dc.subjectplanets and satellites: detectionen_US
dc.subjecttechniques: radial velocitiesen_US
dc.titleHARPS-N Observes the Sun as a Staren_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalApJen_US
dash.depositing.authorCharbonneau, David
dc.date.available2016-07-20T16:53:32Z
dc.identifier.doi10.1088/2041-8205/814/2/L21*
workflow.legacycommentsFAR 2015en_US
dash.authorsorderedfalse
dash.contributor.affiliatedGlenday, Alexander
dash.contributor.affiliatedLi, Chih-Hao
dash.contributor.affiliatedLatham, David
dash.contributor.affiliatedCharbonneau, David
dash.contributor.affiliatedPhillips, David
dash.contributor.affiliatedSasselov, Dimitar
dash.contributor.affiliatedSzentgyorgyi, Andrew
dash.contributor.affiliatedWalsworth, Ronald


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