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Red Optical Planet Survey: A new search for habitable earths in the southern sky
Indexado
WoS WOS:000306140600049
Scopus SCOPUS_ID:84863546114
DOI 10.1111/J.1365-2966.2012.21236.X
Año 2012
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



We present the first results from our Red Optical Planet Survey to search for low-mass planets orbiting late-type dwarfs (M5.5VM9V) in their habitable zones. Our observations with the red arm of the Magellan Inamori Kyocera Echelle spectrograph (0.50.9 m) at the 6.5-m Magellan Clay telescope at Las Campanas Observatory indicate that =92 per cent of the flux lies beyond 0.7 m. We use a novel approach that is essentially a hybrid of the simultaneous iodine and ThAr methods for determining precision radial velocities. We apply least squares deconvolution to obtain a single high signal-to-noise ratio (S/N) stellar line for each spectrum and cross-correlate against the simultaneously observed telluric line profile, which we derive in the same way. Utilizing the 0.620.90 m region, we have achieved an rms precision of 10 ms-1 for an M5.5V spectral type star with spectral S/N 160 on 5-min time-scales. By M8V spectral type, a precision of 30 ms-1 at S/N = 25 is suggested, although more observations are needed. An assessment of our errors and scatter in the radial velocity points hints at the presence of stellar radial velocity variations. Of our sample of seven stars, two show radial velocity signals at 6s and 10s of the cross-correlation uncertainties. We find that chromospheric activity (via Ha variation) does not have an impact on our measurements and are unable to determine a relationship between the derived photospheric line profile morphology and radial velocity variations without further observations. If the signals are planetary in origin, our findings are consistent with estimates of Neptune mass planets that predict a frequency of 1327 per cent for early M dwarfs. Our current analysis indicates the we can achieve a sensitivity that is equivalent to the amplitude induced by a 6 M? planet orbiting in the habitable zone. Based on simulations, we estimate that <10 M? habitable zone planets will be detected in a new stellar mass regime, with =20 epochs of observations. Higher resolution and greater instrument stability indicate that photon-limited precisions of 2 ms-1 are attainable on moderately rotating M dwarfs (with vsin i= 5 km s-1) using our technique.

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Disciplinas de Investigación



WOS
Astronomy & Astrophysics
Scopus
Sin Disciplinas
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Barnes, J. R. Hombre Univ Hertfordshire - Reino Unido
University of Hertfordshire - Reino Unido
2 JENKINS, JAMES STEWART Hombre Universidad de Chile - Chile
Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile
3 Jones, Hugh R. A. Hombre Univ Hertfordshire - Reino Unido
University of Hertfordshire - Reino Unido
4 ROJO-RUBKE, PATRICIO MICHEL Hombre Universidad de Chile - Chile
Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile
5 ARRIAGADA-PINOCHET, PAMELA Mujer Pontificia Universidad Católica de Chile - Chile
6 JORDAN-COLZANI, ANDRES CRISTOBAL Hombre Pontificia Universidad Católica de Chile - Chile
Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile
7 MINNITI-DEL BARCO, DANTE Hombre Pontificia Universidad Católica de Chile - Chile
Vatican Observ - Vaticano
Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile
Vatican Observatory - Italia
8 Tuomi, Mikko Hombre Univ Hertfordshire - Reino Unido
Univ Turku - Finlandia
University of Hertfordshire - Reino Unido
Tuorla Observatory - Finlandia
Tuorlan observatorio - Finlandia
9 Jeffers, S. V. - UNIV GOTTINGEN - Alemania
Universität Göttingen - Alemania
Georg-August-Universitat Gottingen - Alemania
10 Pinfield, David J. Hombre Univ Hertfordshire - Reino Unido
University of Hertfordshire - Reino Unido

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Origen de Citas Identificadas



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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 41.67 %
Citas No-identificadas: 58.33 %

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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 41.67 %
Citas No-identificadas: 58.33 %

Financiamiento



Fuente
FONDECYT
Anillo
European Commission
Science and Technology Facilities Council
BASAL CATA Center for Astrophysics and Associated Technologies
Comite Mixto ESO-Gobierno de Chile
GEMINI-CONICYT FUND
Centro de Astrofisica FONDAP
FONDAP Center for Astrophysics
University of Hertfordshire Research Fellowship
RoPACS, a Marie Curie Initial Training Network
Ministry of Economy ICM Nuclei
MILENIO Milky Way Millennium Nucleus from the Ministry of Economys ICM

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Agradecimientos



Agradecimiento
We thank the referee for careful reading of the manuscript and for suggestions which have improved the final version. JRB gratefully acknowledges funding through a University of Hertfordshire Research Fellowship. JSJ acknowledges funding by Fondecyt through grant 3110004 and partial support from Centro de Astrofisica FONDAP 15010003, the GEMINI-CONICYT FUND and from the Comite Mixto ESO-GOBIERNO DE CHILE. DM and PA gratefully acknowledge support by the FONDAP Center for Astrophysics 15010003, the BASAL CATA Center for Astrophysics and Associated Technologies PFB-06 and the MILENIO Milky Way Millennium Nucleus from the Ministry of Economys ICM grant P07-021-F. AJ acknowledges support from Fondecyt project 1095213, Ministry of Economy ICM Nuclei P07-021-F and P10-022-F and Anillo ACT-086. HRAJ, DP and MT are supported by RoPACS, a Marie Curie Initial Training Network funded by the European Commissions Seventh Framework Programme. JRB, JSJ, DP and SVJ have also received travel support from RoPACS during this research. This paper includes data gathered with the 6.5-m Magellan Telescopes located at Las Campanas Observatory, Chile.

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