NASA explores rocky exoplanet's surface

22 Août, 2019, 11:27 | Auteur: Therese Cote

By measuring the heat coming from a planet almost 49 light-years away, astronomers were able to glean some information about the surface of the rocky world-a rare feat in exoplanet science.

Exoplanet LHS 3844b turned out to be a dead stone.

Scientists from the Harvard Center for Astrophysics used NASA's Transiting Exoplanet Satellite Survey (TESS) telescope to spot planet LTT 1445 A b and its three stars.

As expected, Spitzer's data shows that the planet's dark surface is probably covered in volcanic basalt or magma, or cooled volcanic material, likely from ancient volcano activity. "The planet also is the second closest discovered so far that "transits" its star - that is, the orbit of LTT 1445 AB is tilted at the correct angle to, from our vantage point, pass across the face of the star". The star-facing side of LHS 3844 b reaches temperatures of about 1,410 degrees Fahrenheit (770 degrees Celsius), while the nightside stays at about minus 459 degrees Fahrenheit (minus 273 degrees Celsius), as reported by Scientific American.

According to computer simulations, such a contrast in temperatures on LHS 3844 b means that the planet could only have an atmosphere of about one-tenth the pressure on Earth But in the environment of a red dwarf star, which pumps out high levels of ultraviolet radiation and frequent flares, such a thin atmosphere would nearly certainly be blown away, according to NASA. If LHS 3844b still has an atmosphere, that does not exceed the density of the Martian, which is extremely unexpected for a planet of this size. Though the parent star is cool, it is still comparatively much hotter than the planet, so making direct observation of LHS 3844b's dayside possible.

The team measured the temperature difference between the exoplanet's hot and cold sides and determined that there is an insignificant amount of heat being transferred between the two. But if an atmosphere were present, it would allow for the force of wind to carry hot air to the other side of the planet.

'Miracle on Ice' forward allegedly beat his neighbour with a pipe
KMSP-TV reports the victim had a bruised kidney and several broken bones including two cracked ribs and a fractured vertebra. A judge ordered Pavelich on Monday to undergo a mental health evaluation to see if he was mentally competent to stand trial.

Trump administration unveils plan to allow longer detention of migrant families
Madhuri Grewal, a lawyer with the American Civil Liberties Union, slammed what he called "another cruel attack on children". District Court judge that made the Obama-era ruling, Dolly Gee, rejected the attempt as "cynical" and "unconvincing".

Virtika's David Lesh Survives Half Moon Bay Plane Crash
KTVU's Jana Katsuyama spoke with David Lesh, the pilot of the downed plane, who said he was flying his aircraft with a friend. Two people were on board a small plane when it went down in the waters off Half Moon Bay Harbor in California.

Dubbed LHS 3844b, the planet has no atmosphere but holds to key to understanding where scientists should be looking for signs on life beyond Earth.

Following this observation, Spitzer was able to provide details on the atmosphere of a terrestrial world orbiting an M dwarf, according to NASA.

The presence of an atmosphere on the Earth is the reason liquid water can exist on the surface, enabling life on the planet. On the other hand, the atmospheric pressure of Mars is now less than 1% of Earth's, and the oceans and rivers that once dotted the Red Planet's surface have disappeared.

"Now, with LHS 3844b, we have a terrestrial planet outside our solar system where for the first time we can determine observationally that an atmosphere is not present", explains Kriedberg. They're particularly violent in their youth, belching up a large number of flares, or bursts of radiation and particles that could strip away budding planetary atmospheres. And in this case, the planet is so close to the star that the stellar wind coming off it would probably do away with the atmosphere.

Exceptional yet common Red dwarves themselves aren't uncommon as the smallest and the coolest of the star categories.



Director Quentin Tarantino to become father for the first time
Quentin Tarantino and Daniella Pick are expecting their first baby together according to Y Net. The Once Upon a Time in Hollywood director's wife Daniella Pick is pregnant.

Tennessee woman accused of scalding toddler's feet with hot water
Smith said Vaughn called her that day, in a panic, saying that Kaylee had gotten burned and asked her to come immediately. Smith told WTVC that her daughter is now home from the burn center but will have to have more surgery.

Millie Bobby Brown to launch Gen Z makeup brand Florence by Mills
The Stranger Things actor has been working on the collection in secret for two years now. The caption read, "So here it is, Florence by Mills ".

National Space Council Urges Congress To Approve Space Force
Pence said setting up the command still needs congressional funding and authority, but he said he expects that to happen soon. The Pentagon will stand up a new combatant command before the end of the month, with the official launch of U.S.

New US rule on illegal migrants
DHS officials said in a briefing Tuesday that they have no immediate plans to increase the number of family detention beds. The Flores agreement has been into effect since 1997 but mostly applied to children who came to the country alone.

Astronauts Spacewalk, Install New Docking Port Outside Space Station
NASA astronauts Nick Hague and Andrew Morgan are continuing their spacewalk outside the International Space Station today. The astronauts will install the adapter, to which the Crew Dragon and Starliner spacecraft will dock in the future.

Amanda Anisimova pulls out of US Open after father's death
Anisimova has been out of action recently because of a back injury but was hoping to play the final grand slam of the year. We appreciate the outpouring of love and support during this hard time and ask that you respect our privacy.

Shelter dog lands lead role in ‘Lady and the Tramp’ remake
In the movie tramp the street dog, voiced by Justin Theroux, falls in love with a lady the pedigree pup, voiced by Tessa Thompson. In a Facebook post, HALO Animal Rescue said: "His adopters say he's been such a good boy and loving life".

CBI officials scale wall to enter P Chidambaram's residence
The CBI, caught off guard by the former minister's surprise appearance, had rushed to the party office to arrest him. The apex court said that Chidambaram's petition will be placed before the Chief Justice of India.

États-Unis : Epstein avait fait son testament deux jours avant sa mort
Aucun héritier ne serait nommé dans le testament: seules les personnes chargées de l'exécuter sont évoquées. Le médecin légiste avait conclu vendredi 16 août que l'homme d'affaires s'est bien suicidé par pendaison .