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Radial Velocity

All articles tagged with #radial velocity

Quiet stars may harbor hundreds of undiscovered exoplanets, study finds
space1 month ago

Quiet stars may harbor hundreds of undiscovered exoplanets, study finds

Astronomers propose a method that uses spectra from magnetically quiet stars and radial-velocity analysis to efficiently spot planets. In a study of 24 stars from the Dispersed Matter Planet Project, they identified 14 stars hosting 24 exoplanets (7 new), with an occurrence rate 8–10 times higher than previous radial-velocity surveys. If scaled to about 16,000 nearby stars, the approach could reveal roughly 300 more planets around stars showing low magnetic activity, suggesting a more targeted planet search could be fruitful.

via Live Science|
#dispersed-matter-planet-project#exoplanets#planet-hunting
"Star Trek's Planet Vulcan Proven to Be an Astronomical Illusion"
science-and-technology1 year ago

"Star Trek's Planet Vulcan Proven to Be an Astronomical Illusion"

Astronomers have confirmed that the signals previously thought to indicate the existence of a planet orbiting the star 40 Eridani A, known as Vulcan in Star Trek, were false positives caused by the star's own activity. This finding underscores the importance of advanced tools in accurately identifying exoplanets and ruling out false signals.

via ScienceAlert|
#astronomy#exoplanets#false-positives
"Discovery: Two New Exoplanets Found in Nearby System"
astronomy2 years ago

"Discovery: Two New Exoplanets Found in Nearby System"

Astronomers using the HARPS spectrograph have discovered two additional exoplanets in the GJ 367 planetary system, located 30.7 light years away. The newfound planets, GJ 367 c and GJ 367 d, are at least four times the mass of Earth and have orbital periods of 11.5 days and 34 days, respectively. The study also refined the mass and radius determinations for the previously discovered planet, GJ 367 b. These findings contribute to our understanding of multiplanetary systems and the formation of ultra-short-period exoplanets.

via Phys.org|
#astronomy#exoplanets#gj-367
Possible Discovery of Dark Matter Planets and Rogue Earth-Neptune Pair.
astronomy3 years ago

Possible Discovery of Dark Matter Planets and Rogue Earth-Neptune Pair.

Scientists have theorized that planets made of dark matter could exist and have laid out how they could be detected. These hypothetical planets could be detected through transit data and radial velocity measurements, which could reveal anomalies in their properties that defy our current understanding of planet formation. defy our current understanding of planet formation. The researchers also suggest that the light curve of a dark matter exoplanet could be distinguishable from that of an ordinary exoplanet due to its tiny but non-vanishing interaction strength with Standard Model particles. Further study is needed to set bounds on dark matter exoplanet abundance if they are not detected.

via ScienceAlert|
#astronomy#dark-matter#exoplanets