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radial velocity

This tag is associated with 20 posts

A Planet for Every M Dwarf Star?

A recent result on the commonality of exoplanets has made headlines, but has it for the right reasons?

More hypervelocity stars are jetting out of the galaxy

Palladino et al. find 13 new hypervelocity star candidates in the galaxy and find they probably do not originate from the center of the galaxy.

Finding Serenity: Three Habitable Planets around GJ667C?

This paper reports that the M-dwarf star GJ667C is orbited by a system of six, maybe seven super-Earths, of which three are in the habitable zone. This is an extraordinarily closely packed system of planets, straight from science fiction!

Voyages through the Final Frontier: The Case of HD97658b.

This paper describes the detection of transits for a planet previously identified via radial velocities (RVs). Measuring the properties of the planet with both the transit and RV method allows the authors to determine the density, which suggests it should have a lot of volatiles (e.g. H2O, CO2, etc). This discovery is particularly exciting because the planet orbits a bright, nearby star: ideal for follow-up observations to characterize its atmosphere!

Transit Probabilities: Not As Simple As They Seem

Our simple formula for predicting the probability that an exoplanet will transit might miss something important.

T Tauri (Image Copyright: T. Rector (U. Alaska Anchorage), H. Schweiker, WIYN, NOAO, AURA, NSF)

Searching for Giant Planets Around Baby Stars

How long does planetary migration take? Crockett et al. look for the answer by searching for hot Jupiters around extremely young stars.

Diamonds are an astronomer’s best friend

A team of astronomers and geologists have teamed up to study the composition of a rocky super-Earth which likely contains a layer of carbon in the form of diamond and graphite.

Subset of Figure 2 from Crepp et al. 2012

Three New Small Stars

Low-mass stars are notoriously hard to model. What does the discovery of three new low-mass stars in binaries with Sun-like stars tell us about low-mass stars?

Looking for planets around Barnard’s Star

For the first time ever, radial velocity measurements of Barnard’s Star are used to search for planets. The existence of previously claimed system, involving two Jupiter-sized planets, is ruled out. The upper limits on the non-detection also rule out planets with masses above a few Earth masses.

Hypervelocity stars: what are they running from?

Five new hypervelocity stars have been discovered in the outer regions of the Milky Way. In this paper, the authors discuss what these stars are, how they got so far away, and what their distribution implies about the center of our galaxy.

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