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| 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
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.
| 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
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| 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 |
| Fuente |
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| 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 |
| Agradecimiento |
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| 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. |