Sentences with phrase «radial velocity»

HARPS allows for measurements of radial velocities of stars, which can be affected by the presence of nearby planets, to be taken with the highest accuracy currently available.

We also used radial velocity measurements of the host star, spanning a time range of $ \ sim $ 30 yr, to constrain the companion's mass and orbital properties, as well as to probe the host star's spectral age indicators and general spectral energy distribution.

«The most important discovery in this work is that we have detected the weakest signal and are reaching the limit of detecting Earth analogs using radial velocity method,» Feng said.

A ground - based telescope in Chile discovered 55 of these planets, including HD 85512b, using an instrument called the High Accuracy Radial Velocity Planets Searcher (HARPS).

The MEarth team also used radial velocity data from a larger telescope to detect the planet's gravitational pull on its host star, which yielded a mass estimate.

The paper is titled «Demonstration of a near - IR line - referenced electro - optical laser frequency comb for precision radial velocity measurements in astronomy.»

Analysis of radial velocity variations suggest that this probable red dwarf star has about 15 percent of Sol's mass (Irwin et al, 1992).

As a subgiant star subject to pulsations which affect careful measurements of variations in radial velocity caused by the gravitational pull of substellar companions, astronomers would find it very difficult to detect any Earth - type planet around Beta Hydri using present methods.

Laughlin is a Co-I on the Lick Carnegie Exoplanet Survey, and along with team members Steve Vogt, Paul Butler, Eugenio Rivera and Stefano Meschiari, is using the Keck, Magellan and AAT telescopes to discover and characterize planets with the Doppler radial velocity technique.

For low - mass eclipsing binary stars, the method of eclipse minimum timing allows astronomers to search for smaller masses than those feasible with radial velocity measurements.

[106] Theoretical studies on the detectability via radial velocity analysis have shown that a dedicated campaign of high - cadence observations with a 1 - meter class telescope can reliably detect a hypothetical planet of 1.8 M ⊕ in the habitable zone of B within three years.

All three stars are faint by radial velocity follow - up standards, so we have examined these candidates with regard to eliminating false positives and providing high confidence exoplanet selection.

The Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo (SPLASH) survey used data from the 10 - meter Keck II telescope, fitted with the DEIMOS multi-object spectrograph to measure radial velocities of more than 10,000 individual bright stars in Andromeda.

Abstract: We present the design and test results of a compact optical fiber double - scrambler for high - resolution Doppler radial velocity instruments.

Found via radial velocity variations, the planet's true mass could not be known with knowing whether its orbit around Star B is being viewed edge - on, face - on, or somewhere in between.

In addition to precise differential velocities, this survey will also yield precise barycentric radial velocities for many thousands of stars using the data analysis techniques reported here.

[1] Most of the exoplanets currently known were discovered using indirect techniques — such as radial velocity variations of the host star, or the dip in brightness of the star caused by a transiting exoplanet.

Abstract: We report the discovery of a low - mass companion orbiting the metal - rich, main sequence F star TYC 2949 -00557-1 during the MARVELS (Multi-object APO Radial Velocity Exoplanet Large - area Survey) Pilot Project.

We first generate a stellar field with planetary companions based on radial velocity discoveries, use a planetary evolution model assuming a variable fraction of heavy elements to compute the characteristics of transit events, then apply a detection criterion that includes both statistical and red noise sources.

Built at the UCLA Infrared Laboratory by a team led by Prof. Ian McLean, the instrument is used for radial velocity studies of cool stars, abundance measurements of stars and their environs, planetary science, and many other scientific programs.

The study, led by Christophe Lovis of the Observatory of Geneva, relies on a type of observation called radial velocity measurements, which track Doppler shifts in a star's light spectrum as it moves closer to or farther away from an observer.

Initially identified a decade ago through radial velocity measurements, it was later confirmed through transit observations with the MOST and Spitzer space telescopes.

Past radial velocity analysis suggests that giant planets of one tenth to 10 times the mass of Jupiter do not exist within 0.1 to four AUs of Iota Persei (Cummings et al, 1999).

A 2.5 - year search analyzing radial velocities failed to find a large Jupiter or brown dwarf within 10 AUs of Gamma Pavonis (Murdoch et al, 1993).

We combine this dataset with distance estimates... ▽ More Our long term aim is to derive model - independent stellar masses and distances for long period massive binaries by combining apparent astrometric orbit with double - lined radial velocity amplitudes (SB2).

[2] The team looked at radial velocity data of Gliese 667C, a method often used to hunt for exoplanets.

Still, many of the nearby planets are detectable via three exoplanet hunting methods: planetary transits, high - contrast imaging, and stellar radial velocity measurements.

... ▽ More We report the discovery of a low - mass companion orbiting the metal - rich, main sequence F star TYC 2949 -00557-1 during the MARVELS (Multi-object APO Radial Velocity Exoplanet Large - area Survey) Pilot Project.

We believe this was the first radial velocity detection of an extrasolar planet by amateurs.

A recent 2.5 - year search analyzing radial velocities failed to find a large Jupiter or brown dwarf within 10 AUs of Delta Eridani (Murdoch et al, 1993, pages 2 and 10).

That is why the first radial velocity planet (51 Peg), the first transiting planet (OGLE - TR - 056), the first microlensing planet (OGLE 2003 - BLG - 235L), and the first directly imaged planet (GQ Lupi b) were all Jupiter - like or larger.

Such an instrument performance budget is a necessity for both identifying the variety of noise sources currently limiting Doppler measurements, and estimating the achievable performance of next generatio... ▽ More We describe a detailed radial velocity error budget for the NASA - NSF Extreme Precision Doppler Spectrometer instrument concept NEID (NN - explore Exoplanet Investigations with Doppler spectroscopy).

Alan Boss's book offers an enjoyable insider's view on the birth of the exoplanet field: from the first radial velocity discoveries until the launch of the Kepler mission, Alan gives a diary - like summary of the major new exoplanet discoveries and results, including the controversies, debates, and the impact of politics and space policies on the science of exoplanets.

Francis, C. & Anderson, E. Calculation of the local standard of rest from 20 574 local stars in the New Hipparcos Reduction with known radial velocities.

The significant radial velocity trend coupled with the imaging data indicate that the most probable orbit has a semimajor axis of about 50 AU.The discrepancy between the age indicators suggested against a bona - fide young star.

In July 2008, astronomers (Michael Endl and Martin Kürster) analyzed used seven years of differential radial velocity measurements for Proxima Centauri to submit a paper indicating that large planets are unlikely to be orbiting Sol's closest stellar neighbor within its habitable zone — around 0.022 to 0.054 AU with a corresponding orbital period of 3.6 to 13.8 days.

Our latest article, by Eloy Rodríguez, explains how we are using photometry to complement radial velocity data from HARPS.

This technology, when coupled with a high spectral resolution spectrograph, offers the promise of $ < $ 1 m / s radial velocity precision suitable for the detection of Earth - sized planets in the habitable zones of cool M - type stars.