New Earth-Sized Planet Candidate HD 137010 b Presents Cold Climate Possibilities
Astronomers found a new Earth-sized planet candidate, HD 137010 b, 146 light-years away. It might be colder than Mars. Further study is needed.
#Exoplanet #Astronomy #SpaceDiscovery #HD137010b #ColdPlanet
https://newsletter.tf/earth-sized-planet-hd-137010-b-colder-than-mars-146-light-years-away/
A new planet candidate, HD 137010 b, is Earth-sized but may be much colder than Mars. This is a new discovery from Kepler's K2 mission.
#Exoplanet #Astronomy #SpaceDiscovery #HD137010b #ColdPlanet
https://newsletter.tf/earth-sized-planet-hd-137010-b-colder-than-mars-146-light-years-away/
Un Esopianeta a 146 anni luce da noi. Scoperto un nuovo "gemello" della Terra a 146 anni luce: potenzialmente abitabile, ma freddo come Marte. Un team internazionale di astronomi ha annunciato la scoperta di un nuovo esopianeta che potrebbe rappresentare uno dei candidati più interessanti nella ricerca di mondi abitabili.
https://scienzamagia.eu/scienza-e-tecnologia/un-esopianeta-a-146-anni-luce-da-noi/
#biofirme #esopianera #HD137010b #pianetaabitabile #vitaextraterrestre #zonaabitabile
A Cool Earth-sized Planet Candidate Transiting a Tenth Magnitude K-dwarf From K2
The transit method is currently one of our best means for the detection of potentially habitable "Earth-like" exoplanets. In principle, given sufficiently high photometric precision, cool Earth-sized exoplanets orbiting Sun-like stars could be discovered via single transit detections; however, this has not previously been achieved. In this work, we report a 10-hour long single transit event which occurred on the $V=10.1$ K-dwarf HD 137010 during K2 Campaign 15 in 2017. The transit is comparatively shallow ($225\pm10$ ppm), but is detected at high signal-to-noise thanks to the exceptionally high photometric precision achieved for the target. Our analysis of the K2 photometry, historical and new imaging observations, and archival radial velocities and astrometry strongly indicate that the event was astrophysical, occurred on-target, and can be best explained by a transiting planet candidate, which we designate HD 137010 b. The single observed transit implies a radius of $1.06^{+0.06}_{-0.05}$ $R_\oplus$, and assuming negligible orbital eccentricity we estimate an orbital period of $355^{+200}_{-59}$ days ($a=0.88^{+0.32}_{-0.10}$ AU), properties comparable to Earth. We project an incident flux of $0.29^{+0.11}_{-0.13}$ $I_\oplus$, which would place HD 137010 b near the outer edge of the habitable zone. This is the first planet candidate with Earth-like radius and orbital properties that transits a Sun-like star bright enough for substantial follow-up observations.
Nově objevená exoplaneta, nacházející se relativně blízko (146 světelných let), má asi 51% šanci nacházet se v obyvatelné zóně své hvězdy. Hodně by záviselo na složení a hustotě atmosféry - pravděpodobnost, že klima planety připomíná spíš Mars, než Zemi, je poměrně velká.
Planeta HD 137010 b byla objevena analýzou starších dat observatoře Kepler.
Planety na vzdálenějších oběžných drahách, podobných Zemi, je daleko těžší v datových sadách identifikovat. Přechod této planety přes pozorovatelný kotouč svojí mateřské hvězdy trvá 10 dní (v případě Země by to bylo 13 dnů)
https://astrobiology.com/2026/01/exoplanet-candidate-hd-137010-b-an-ice-cold-earth-analog.html
Alexander Venner,
currently studying at the Max Planck Institute for Astronomy,
picked his way by hand through the data collected by a now-retired NASA space-based telescope called Kepler,
which was used to examine the sky for exoplanets during a survey of 500,000 stars that ended 8 years ago.
Datasets like these are huge, and often combed through with search algorithms,
but the PhD student managed what others did not by rolling up his sleeves, so to speak.
“It was completely missed,” Mr. Venner told Science Magazine about his discovery, presented at the Rocky Worlds conference in Groningen.
“The best way to detect it was to actually just look."
At just 146 light years away, it’s close enough for Kepler to have recorded the presence of such a small planet,
and for the most powerful telescopes of the day to record it in great detail.
Scientists look for exoplanets by centering a telescope on a distant star and waiting to see a dip in the star’s light,
indicating there’s something orbiting the star large enough to reduce the light signal—a planet.
This is called the transit method.
The first man to ever identify an exoplanet this way concluded shortly after there must be millions of them.
Indeed, the number of known planets beyond our solar system has passed 6,000,
-- yet those which are Earth-like in orbit and mass number merely a few dozen.
Most known exoplanets are large and hot,
making for easy detection because of the larger dips in light described earlier.
Smaller, Earth-sized, rocky worlds orbiting within their star’s habitable zone are not only of the greatest interest to scientists, they’re also much harder to spot, since they’re cooler and smaller.
Search algorithms passed over its faint signal in the Kepler data.
Venner came across the data through the "Planet Hunters" project
which recruits citizen scientists and volunteer enthusiasts to search through data from Kepler and other planet-hunting telescopes to look for signals left behind by larger surveys.
The exoplanet orbits a
"K-dwarf star" designated
#HD137010.
This planet is called
#HD137010b
https://www.goodnewsnetwork.org/citizen-scientist-spots-earth-like-planet-now-astrophysicists-will-focus-most-powerful-telescopes-on-it/
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