15 new planets confirmed around cool dwarf stars
Conceptual illustration. A key outcome from the current studies was that planets orbiting red dwarfs may have remarkably similar characteristics to planets orbiting solar-type stars.
Scientists report the existence of 15 new planets — including one ‘super-Earth’ that could harbor liquid water — orbiting small, cool stars near our solar system. These stars, known as red dwarfs, are of enormous interest for studies of planetary formation and evolution.
A research team led by Teruyuki Hirano of Tokyo Institute of Technology’s Department of Earth and Planetary Sciences has validated 15 exoplanets orbiting red dwarf systems.
One of the brightest red dwarfs, K2-155 that is around 200 light years away from Earth, has three transiting super-Earths, which are slightly bigger than our own planet. Of those three super-Earths, the outermost planet, K2-155d, with a radius 1.6 times that of Earth, could be within the host star’s habitable zone.
The findings, published in the form of two papers in The Astronomical Journal, are based on data from NASA Kepler spacecraft’s second mission, K2, and follow-up observations using ground-based telescopes, including the Subaru Telescope in Hawaii and the Nordic Optical Telescope (NOT) in Spain.
The researchers found that K2-155d could potentially have liquid water on its surface based on three-dimensional global climate simulations. Hirano expresses both excitement and restraint, as he says: “In our simulations, the atmosphere and the composition of the planet were assumed to be Earth-like, and there’s no guarantee that this is the case.”
A more precise estimate of the radius and temperature of the K2-155 star would be needed to conclude definitively whether K2-155d is habitable. Achieving such precision would require further studies, for example, using interferometric techniques.
A key outcome from the current studies was that planets orbiting red dwarfs may have remarkably similar characteristics to planets orbiting solar-type stars.
“It’s important to note that the number of planets around red dwarfs is much smaller than the number around solar-type stars,” says Hirano. “Red dwarf systems, especially coolest red dwarfs, are just beginning to be investigated, so they are very exciting targets for future exoplanet research.”
For example, while the so-called radius gap of planets around solar-type stars has been reported previously, this is the first time that researchers have shown a similar gap in planets around red dwarfs. “This is a unique finding, and many theoretical astronomers are now investigating what causes this gap,” says Hirano.
He adds that the most likely explanation for the lack of large planets in the proximity of host stars is photoevaporation, which can strip away the envelope of the planetary atmosphere.
The researchers also investigated the relationship between planet radius and metallicity of the host star. “Large planets are only discovered around metal-rich stars,” Hirano says, “and what we found was consistent with our predictions. The few planets with a radius about three times that of Earth were found orbiting the most metal-rich red dwarfs.”
The studies were conducted as part of the KESPRINT collaboration, a group formed by the merger of KEST (Kepler Exoplanet Science Team) and ESPRINT (Equipo de Seguimiento de Planetas Rocosos Intepretando sus Transitos) in 2016.
With the planned launch of NASA’s Transiting Exoplanet Survey Satellite (TESS) in April 2018, Hirano is hopeful that even more planets will be discovered. “TESS is expected to find many candidate planets around bright stars closer to Earth,” he says. “This will greatly facilitate follow-up observations, including investigation of planetary atmospheres and determining the precise orbit of the planets.”
Edited by Ariasun editorial board
for ariasun products online shopping ,click here.
website ariasuniweb net ariasuniportal ariasuni Health Journal Family physician Medical Health Ariasan Elcomp </ em> Elcomp Exhibition </ em> Online Elcomp Therapy Health Electronics Tourism Aryans City Net Soocom Ariasun Soopak Ariasun medipharma Advertisement Reader The requirements Employment Currency Exchange Currency Coin Gold < em> car property land building stock exchange bank Government People Leader Assembly Quran Book Student University Knowledge base Exercise Sima Sound Religion < / em> Life People Hope Work Dread Unemployment youth exercise information technology computer < / em> Hardware Software Computer Server Virtual Tablet < / em> Mobile Zanjan Tehran Iran Germany Greece Georgia Georgia Dubai World Air Space < em> Country Product Finder AriaSun International Group Online Store WikiPharma AriaSun Production Industrial Operations Equip Installation & Investment Air Space International Trading Research Industrial Business Medical Dummy Undoubtedly Health Drug Therapy Health Information Technology & Computer Airlines Tourism Logo Design Sticker Design Advertising Campaign Science & Research News </em > Political News Economic Trade International Stock Market News Medical Tourism & Cultural Heritage Aeronautics & Tourism Sport & Olympic Domain and University The Quran Arts & Culture Industry & Technology Accidents Ladies Currency and Gold Coins Flats Rip’s Web Site Kandasheh Ahwaz Web Site Foot Website Abuse Clean Sean Cinere Live Nature Whats Punababy Mussels Clinic Radarians Man AriaSun Preddies Reservations < Em> Tourists Unemployment youth exercise CityNet PakSaman SooComAriaSun SooPakAriaSun MediPharma AriaSun Kalayab AriaSunBazar AriaSunBazar Medeca MediKala Artists Group AriaSunGroup Web site designing RP Pilgrimage website Historical tours website Web Resident Resorts site Tours website The Pana The Natural Tours Website Kandesheh Ahwaz The Scientific Tour Website Oil & Refineries The Sports Tour Website Gas The Web Tours Water Exposure Tour Site Travel Tour Website Travel Tours The Last-minute Tours Site Tours of the last minute Web-site of the local tours Recreation site Internal tours site Pilgrimage Fun Places Design Web Design City Net Designing a Holiday Resort Pilgrimage Pilgrimage Website designing pilgrimage City Net Pilgrimage Travel </em > Designing Travel Planner Website Designing Travel Places Historic Places Designing Historic Places Historic Places Design Residences Residential Residential Design Residential Residential Design Cultural Places Designing a Web Site for Cultural Places Designing Cultural Places Natural Places Natural Places Designing a natural site Designing a natural website scientific Designing for scientific Designing for scientific sports sports designing sports < Em> Sports Facilities Design Sports Facilities Sport Sport Designing a Sports Center for Extreme Sports Creating places Designing for Exhibition Exhibit places Designing Exhibit Places Designing Exposure Website Web Recreation Recreation Web Design Recreational tours The design of the tourist resorts Pilgrimage Pilgrimage Pilgrimage Pilgrimage Pilgrimage Tours Historic Tours Tour Design Historic Tours Web Tour Design Historical Tours Residential Tours Resorts Tour Design Residential Tour Website Design Cultural Design Cultural Tour Site Cultural Tour Website Natural Designing Natural Tours Designing Natural Tours Web Site Science Designing Scientific Tours Designing Sci-Fi Web Site Designing a Sports Tour Designing a Sports Tour Website Designing a Tours Tour Designing a Touring Web Site Exhibit Exhibit Tour Travel Designing Tours Tour The Last Moment Toure The Last Moment Designing the Last Minute Tours Internal Tours Designing Local Tours Designing a Web Site Tour </em > Foreign Tours Designing a Tours Site Designing a Website for Tours Coastal Work < em> Designing the Coast Guided Tour Urban Designing Urban Tours Urban Touring Sights < Em> Sightseeing Design Sightseeing Web Site Mountaineering Sailing Designing Sailing Tours < Em> Website Designing Sailing Tours Aviation Designing Tours Cruising Cruising ships Creating cruise ship cruises Creating Cruise Cruises Inbound Flights Designing Inbound Flights Foreign Flights Designing a Foreign Airmail Web site Last Minute Flights Web Design Last Minute Deals cheap Website Design Cheap Flights Online Shopping Online Sales Online Selling Website Design Online Shopping Online Store Online Store Design Online Tickets Design an Online Ticket Internet Designing a Web Store Internet Tickets Designing an Internet Ticket > parscoders
Finance & Administration
Soopak Ariasun ( IT )
Sookam Ariasun ( Medical and Veterinary )
Aerospace ( Pad Ariasun )
Manufacture and production ( Rad Ariasun )
Airline and Tourism ( Man Ariasun )
International Commerce ( Mad Ariasun )
Research Center Ariasun ( R&D&C )
Cultural,Satellite and Digital
AriaSun International Group