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Red Dwarf

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JWST finds a 'Forbidden Planet' with a metal-poor atmosphere that defies theory
science1 month ago

JWST finds a 'Forbidden Planet' with a metal-poor atmosphere that defies theory

JWST's transit spectroscopy of TOI-5205 b—a Jupiter-sized planet orbiting a 0.4-solar-mass red dwarf about 280 light-years away—reveals an atmosphere unexpectedly poor in metals, even less metal-rich than its host star. This contradicts core accretion models and the assumed link between star and planet metallicity, earning the world the moniker 'forbidden planet' and raising questions about how giants form around low-mass stars. Results are based on three transits and require further observations and refined modeling to confirm and fully interpret.

via CPG Click Petróleo e Gás|
#exoplanets#jwst#metallicity
Inside-Out Exoplanet System Upends Formation Theory
world3 months ago

Inside-Out Exoplanet System Upends Formation Theory

CHEOPS observations reveal four planets orbiting the red dwarf LHS 1903 far closer to their star than Mercury is to the Sun: two rocky super-Earths and two gaseous mini-Neptunes. The outermost planet, surprisingly rocky, challenges standard models that predict rocky worlds close in and gas giants farther out, suggesting an 'inside-out' assembly in which gas was depleted by inner planets or the atmosphere was stripped after formation. With a mass of about 5.8 Earth masses and a surface temperature around 60°C, it could be marginally habitable, and future JWST studies could probe its atmosphere.

via Dawn|
#cheops#exoplanets#habitability
Giant planet found orbiting tiny red star challenges planetary formation theories
science1 year ago

Giant planet found orbiting tiny red star challenges planetary formation theories

Scientists discovered a massive planet, TOI-6894b, orbiting a low-mass red dwarf star, challenging existing theories of planet formation, as such large planets were thought unlikely to form around such small stars. This finding suggests many more giant planets may exist around small stars in the galaxy, prompting a reevaluation of current models.

via Live Science|
#exoplanets#nasa-tess#planet-formation
Scientists Unravel Mystery Behind Cosmic Radio Bursts
science1 year ago

Scientists Unravel Mystery Behind Cosmic Radio Bursts

Astronomers have traced a mysterious pulsing radio signal from deep within the Milky Way back to a red dwarf star, marking the first time such a signal's origin has been identified. The signal, named GLEAM-X J0704-37, is the slowest of its kind, emitting minute-long pulses every three hours. Researchers used the Murchison Widefield Array in Australia and the MeerKAT in South Africa to pinpoint the source, suggesting the signal is generated by interactions between a red dwarf's stellar wind and a white dwarf's magnetic field. This discovery opens new avenues for understanding cosmic radio waves.

via New York Post |
#astronomy#milky-way#murchison-widefield-array
Asteroid Impacts on Neutron Stars Could Explain Mysterious Radio Bursts
science1 year ago

Asteroid Impacts on Neutron Stars Could Explain Mysterious Radio Bursts

Astronomers have traced mysterious, repeating radio bursts to a red dwarf star likely in a binary orbit with a white dwarf. These long-period radio transients, first discovered in 2022, challenge existing theories as they pulse every 18 minutes, unlike typical radio pulsars. The discovery of a new source, GLEAM-X J0704-37, with pulses every 2.9 hours, suggests the radio waves may result from interactions between the red dwarf's stellar wind and the white dwarf's magnetic field. This finding could lead to a better understanding of such cosmic phenomena.

via Livescience.com|
#astronomy#binary-star-system#radio-waves
Astronomers Trace Mysterious Radio Bursts to Unusual Star Pair
science1 year ago

Astronomers Trace Mysterious Radio Bursts to Unusual Star Pair

Astronomers have traced mysterious repeating radio bursts, first discovered in 2022, to a red dwarf star likely in a binary orbit with a white dwarf. These long-period radio transients, including the newly identified GLEAM-X J0704-37, challenge existing theories as they emit radio waves at much slower intervals than known pulsars. The interaction between the red dwarf's stellar wind and the white dwarf's magnetic field is believed to generate these signals, offering new insights into cosmic phenomena.

via Phys.org|
#astronomy#milky-way#radio-waves
Astronomers Unravel Mystery Behind Record-Breaking Radio Signal
science1 year ago

Astronomers Unravel Mystery Behind Record-Breaking Radio Signal

Astronomers have identified a record-breaking energy burst from a binary system containing a red dwarf and a white dwarf, located 5,000 light-years away. This burst, known as GLEAM-X J0704-37, is the longest-period example of long-period radio transients, a phenomenon that has puzzled scientists for nearly two decades. The discovery, made using data from the Murchison Widefield Array and the MeerKAT telescope, suggests that strong magnetic fields in the system may be responsible for the periodic energy emissions. This finding opens the possibility of uncovering more such transients in existing astronomical data.

via Space.com|
#astronomy#binary-star-system#radio-transients
Robotic Telescopes Discover Unique Earth-Sized Exoplanet Orbiting Ultra-Cool Star
science-and-space2 years ago

Robotic Telescopes Discover Unique Earth-Sized Exoplanet Orbiting Ultra-Cool Star

An international team discovered an Earth-sized exoplanet, SPECULOOS-3 b, orbiting an ultra-cool red dwarf 55 light-years away. The planet, likely lacking an atmosphere due to intense radiation, offers insights into the habitability of planets around long-lived red dwarfs, which could burn for 100 billion years. This discovery, part of the SPECULOOS project, highlights the potential for further study using the James Webb Space Telescope.

via SciTechDaily|
#astronomy#exoplanet#habitability