scholarly journals The ELODIE and SOPHIE Search for Northern Extrasolar Planets: Jupiter-Analogs around Sun-Like Stars

2012 ◽  
Vol 8 (S293) ◽  
pp. 445-447
Author(s):  
I. Boisse ◽  
F. Pepe ◽  
C. Perrier ◽  
D. Queloz ◽  
F. Bouchy ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Extrasolar Planets ◽  
Velocity Measurements ◽  
Long Period

AbstractWe present radial-velocity measurements (RV) obtained in one of the numbers of programs underway to search for extrasolar planets with the spectrograph SOPHIE at the 1.93-m telescope of the Observatoire de Haute-Provence. Targets were selected from catalogs observed with ELODIE, which had been mounted previously at the telescope, in order to detect long-period planets with an extended database close to 15 years.

scholarly journals Searching for Planetary Companions to Ultracool Dwarfs: Planet Hunting in the Near Infrared

2008 ◽  
Vol 4 (S253) ◽  
pp. 346-349
Author(s):  
Cullen H. Blake ◽  
David Charbonneau ◽  
David W. Latham
Keyword(s):  
Radial Velocity ◽  
Near Infrared ◽  
Extrasolar Planets ◽  
Terrestrial Planets ◽  
Habitable Zone ◽  
Velocity Measurements ◽  
Ultracool Dwarfs

AbstractOwing to their small masses and radii, Ultracool Dwarfs (UCDs; late-M, L, and T dwarfs) may be excellent targets for planet searches and may afford astronomers the opportunity to detect terrestrial planets in the habitable zone. The precise measurements necessary to detect extrasolar planets orbiting UCDs represent a major challenge. We describe two efforts to obtain precise measurements of UCDs in the Near Infrared (NIR). The first involves the robotic NIR observatory PAIRITEL and efforts to obtain photometric precision sufficient for the detection of terrestrial planets transiting UCDs. The second effort involves precise radial velocity measurements of UCDs in the NIR and a survey undertaken with the NIRSPEC spectrograph on Keck.

scholarly journals NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit

2020 ◽  
Vol 499 (3) ◽  
pp. 3139-3148
Author(s):  
Edward M Bryant ◽  
Daniel Bayliss ◽  
Louise D Nielsen ◽  
Dimitri Veras ◽  
Jack S Acton ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Effective Temperature ◽  
Low Density ◽  
Next Generation ◽  
Velocity Measurements ◽  
Long Period ◽  
Transmission Spectroscopy ◽  
Stellar Properties

ABSTRACT We report the discovery of the transiting exoplanet NGTS-12b by the Next Generation Transit Survey (NGTS). The host star, NGTS-12, is a V = 12.38 mag star with an effective temperature of Teff = 5690 ± 130 K. NGTS-12b orbits with a period of P = 7.53 d, making it the longest period planet discovered to date by the main NGTS survey. We verify the NGTS transit signal with data extracted from the Transiting Exoplanet Survey Satellite (TESS) full-frame images, and combining the photometry with radial velocity measurements from HARPS and FEROS we determine NGTS-12b to have a mass of 0.208 ± 0.022 MJ and a radius of 1.048 ± 0.032 RJ. NGTS-12b sits on the edge of the Neptunian desert when we take the stellar properties into account, highlighting the importance of considering both the planet and star when studying the desert. The long period of NGTS-12b combined with its low density of just 0.223 ± 0.029 g cm−3 make it an attractive target for atmospheric characterization through transmission spectroscopy with a Transmission Spectroscopy Metric of 89.4.

scholarly journals Transit & RV Observations of Exoplanets by the 1-m Telescope at Weihai

2012 ◽  
Vol 8 (S293) ◽  
pp. 33-35
Author(s):  
Chen Cao ◽  
Dayong Ren ◽  
Dongyang Gao ◽  
Jicheng Zhang ◽  
Nan Song ◽  
...  
Keyword(s):  
High Resolution ◽  
Radial Velocity ◽  
Extrasolar Planets ◽  
Physical Parameters ◽  
Velocity Measurements ◽  
Preliminary Results

AbstractBy using the 1-m reflecting telescope at Weihai Observatory of Shandong University, the transit observations of seven stars are carried out to accurately estimate the physical parameters of extrasolar planets. Besides, a new high-resolution spectrograph (WES) was installed on this telescope for radial velocity measurements on exoplanets, we will show some preliminary results.

scholarly journals Derivation of orbital parameters of very low mass companions in double stars from radial velocities and observations of space astrometry missions like HIPPARCOS, DIVA and GAIA

1999 ◽  
Vol 170 ◽  
pp. 410-415
Author(s):  
H.-H. Bernstein
Keyword(s):  
Radial Velocity ◽  
Extrasolar Planets ◽  
Brown Dwarfs ◽  
Optimal Estimation ◽  
Velocity Measurements ◽  
Orbital Parameters ◽  
Double Stars ◽  
Observation Methods ◽  
Low Mass ◽  
Space Astrometry

AbstractRadial velocity measurements are a well known high-precision method to obtain the orbits of extrasolar planets or brown dwarfs. However, this method is not able to determine the inclination which could be derived from astrometry. The astrometric effects of those objects are very minute, wherefore the interest of astronomers in astrometric techniques was very poor. This situation changes fundamentally since space astrometry observations are available. HIPPARCOS demonstrated the power of space astrometry and the extremely high accuracy of the DIVA, and especially the GAIA observations allows one to detect Jupiter- and Earth- like objects. The optimal estimation of the parameters of the orbit of extrasolar planets or brown dwarfs is a combination of radial velocity measurements and space astrometry observations. Here it is possible to overcome problems which are inherent in both observation methods, so space astrometry complements radial velocity observations and vice versa. This paper gives a method for the parameter estimation using both types of measurements.

scholarly journals High Precision Photometry from EulerCam and TRAPPIST: The Case of WASP-42, WASP-49 and WASP-50

2012 ◽  
Vol 8 (S293) ◽  
pp. 119-121
Author(s):  
Monika Lendl ◽  
Michaël Gillon ◽  
Didier Queloz
Keyword(s):  
Radial Velocity ◽  
High Precision ◽  
Extrasolar Planets ◽  
High Accuracy ◽  
Velocity Measurements ◽  
Very High

AbstractTransiting extrasolar planets provide unmatched insights into the structure and composition of close-in planets. When a planet transits its host star, its radius is known, which together with radial velocity measurements, allows accessing the planetary density. We present results obtained using the Euler and TRAPPIST telescopes that aim at reaching very high accuracy on the parameters derived from transit lightcurves. Here, we show the case of the recently discovered WASP-42b and WASP-49b and new observations of WASP-50b.

scholarly journals Direct Imaging Of Long Period Radial Velocity Targets With NICI

2013 ◽  
Vol 8 (S299) ◽  
pp. 66-67
Author(s):  
Graeme S. Salter ◽  
Chris G. Tinney ◽  
Robert A. Wittenmyer ◽  
James S. Jenkins ◽  
Hugh R.A. Jones ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Near Infrared ◽  
Minimum Mass ◽  
Post Processing ◽  
Velocity Measurements ◽  
Brown Dwarf ◽  
Direct Imaging ◽  
Parameter Spaces ◽  
Long Period ◽  
Imaging Parameter

AbstractWe are finally entering an era where radial velocity and direct imaging parameter spaces are starting to overlap. Radial velocity measurements provide us with a minimum mass for an orbiting companion (the mass as a function of the inclination of the system). By following up these long period radial velocity detections with direct imaging we can determine whether a trend seen is due to an orbiting planet at low inclination or an orbiting brown dwarf at high inclination. In the event of a non-detection we are still able to put a limit on the maximum mass of the orbiting body. The Anglo-Australian Planet Search is one of the longest baseline radial velocity planet searches in existence, amongst its targets are many that show long period trends in the data. Here we present our direct imaging survey of these objects with our results to date. ADI Observations have been made using NICI (Near Infrared Coronagraphic Imager) on Gemini South and analysed using an in house, LOCI-like, post processing.

scholarly journals A long-period (P = 61.8 d) M5V dwarf eclipsing a Sun-like star from TESS and NGTS

2020 ◽  
Vol 495 (3) ◽  
pp. 2713-2719 ◽  
Author(s):  
Samuel Gill ◽  
Benjamin F Cooke ◽  
Daniel Bayliss ◽  
Louise D Nielsen ◽  
Monika Lendl ◽  
...  
Keyword(s):  
South Africa ◽  
Radial Velocity ◽  
Stellar Evolution ◽  
Orbital Period ◽  
Next Generation ◽  
Velocity Measurements ◽  
Long Period ◽  
Better Than

ABSTRACT The Transiting Exoplanet Survey Satellite has produced a large number of single-transit event candidates which are being monitored by the Next Generation Transit Survey (NGTS). We observed a second epoch for the TIC-231005575 system (Tmag = 12.06 and $T_{\rm eff} = 5500 \pm 85\, \mathrm{ K}$) with NGTS and a third epoch with Las Cumbres Observatory’s telescope in South Africa to constrain the orbital period ($P = 61.777\, \mathrm{ d}$). Subsequent radial velocity measurements with CORALIE revealed the transiting object has a mass of M2 = 0.128 ± 0.003 M⊙, indicating the system is a G-M binary. The radius of the secondary is R2 = 0.154 ± 0.008 R⊙ and is consistent with mesa models of stellar evolution to better than 1σ.

scholarly journals Radial-Velocity Searches for Exoplanets in East Asia

2012 ◽  
Vol 8 (S293) ◽  
pp. 1-9
Author(s):  
Bun'ei Sato
Keyword(s):  
East Asia ◽  
Radial Velocity ◽  
Extrasolar Planets ◽  
East Asian ◽  
Research Field ◽  
Velocity Measurements ◽  
Intermediate Mass ◽  
East Asian Region ◽  
The Past ◽  
Intermediate Mass Stars

AbstractHundreds of extrasolar planets have been discovered around various types of stars by various techniques during the past decade. Among them precise radial velocity measurements for stars are fundamental technique to detect and confirm exoplanets. In this paper activities in East-Asian region in this research field are introduced: East-Asian Planet Search Network, which is a network searching for planets around evolved intermediate-mass stars, and Subaru/IRD project, which will search for habitable planets around M-type dwarfs using infrared radial-velocity method.

scholarly journals The SOPHIE search for northern extrasolar planets

2018 ◽  
Vol 618 ◽  
pp. A103 ◽  
Author(s):  
M. J. Hobson ◽  
R. F. Díaz ◽  
X. Delfosse ◽  
N. Astudillo-Defru ◽  
I. Boisse ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Extrasolar Planets ◽  
Habitable Zone ◽  
Minimum Mass ◽  
Velocity Measurements ◽  
High Eccentricity ◽  
Dwarf Stars ◽  
M Stars ◽  
M Dwarf Stars ◽  
M Dwarf

We report the detection of two exoplanets and a further tentative candidate around the M-dwarf stars Gl96 and Gl617A, based on radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. Both stars were observed in the context of the SOPHIE exoplanet consortium’s dedicated M-dwarf subprogramme, which aims to detect exoplanets around nearby M-dwarf stars through a systematic survey. For Gl96 we present the discovery of a new exoplanet at 73.9 d with a minimum mass of 19.66 earth masses. Gl96 b has an eccentricity of 0.44, placing it among the most eccentric planets orbiting M stars. For Gl617A we independently confirm a recently reported exoplanet at 86.7 d with a minimum mass of 31.29 earth masses. Both Gl96 b and Gl617A b are potentially within the habitable zone, although the high eccentricity of Gl96 b may take it too close to the star at periapsis.

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