. 24/7 Space News .
EXO WORLDS
The race to trace TRAPPIST-1h
by Staff Writers
Bern, Switzerland (SPX) May 29, 2017


The orbits of the seven planets around the star TRAPPIST-1. The grey region is the zone, where liquid water could exist on the surface of the planets. On planet TRAPPIST-1 h liquid water is possible under a thick layer of ice. (1 AU is the distance between the Sun and the Earth.) Credit: A. Triaud

After 60 hours of non-stop work, researchers at the University of Bern being part of an international team reached their hoped-for goal: They were the first to measure the orbital period for the outermost planet of the famous TRAPPIST-1 system which made The race to trace TRAPPIST-1hs worldwide. The new result confirms that the seven Earth-size planets around the ultra-cool dwarf are lined up in a chain with resonances linking every member.

"We knew that we had to be very fast to be the first ones", says Marko Sestovic, PhD student at the University of Bern's Center for Space and Habitability (CSH). "If you are not the first, nobody cares about your effort", adds CSH postdoc Simon Grimm.

NASA had started the global research race with announcing the public release of data about two months ahead of schedule. Its Kepler Space Telescope had observed the star TRAPPIST-1 from mid-December until early March. Previous observations with telescopes on the ground and in space had revealed that the ultra-cool dwarf is orbited by seven Earth-size planets, a larger number than detected in any other transiting exoplanetary system. Whereas the astrophysicists could determine the orbital periods for the first six planets, the period of the outermost planet remained unconstrained.

Only four days after the end of the Kepler observing campaign, NASA made the dataset publicly available. The researchers in Bern had already teamed up with colleagues at the University of Washington and other scientists in the US, Belgium, France, UK, Saudi Arabia and Morocco to be able to start work immediately.

Simon Grimm had developed a tool to automatically download and process the data as soon as they were made available, whereas Marko Sestovic developed a pipeline to perform the data analysis. The same job was independently done by Rodrigo Luger, PhD student in Seattle.

Removing the noise
Normally, NASA calibrates the data of the Kepler Space Telescope in a lengthy procedure before public release, but this time the researchers got only the raw dataset. "Due to technical problems, the Kepler spacecraft is no longer able to maintain its pointing direction accurately, causing it to drift and jitter as its thrusters fight to keep it pointed at the star", explains Sestovic: "This introduces strong instrumental signals and a lot of noise that must be removed. The noise can be several times bigger than the transit signal we are looking for".

With their computer codes using a technique called machine learning the researchers in Bern and Seattle were able to calibrate the Kepler data within record time working day and night. "Every hour counts when there is a risk of being scooped", says CSH professor Brice-Olivier Demory.

To determine the orbital period of the outermost planet called TRAPPIST-1h the researchers counted on theory. They had already found that because of gravitational interactions the periods of the inner planets were linked: For instance, if planet b orbits the star eight times, planet c completes five orbits, and planet d three - a phenomena called mean-motion resonance.

If planet h was also in resonance with its neighbouring planets f and g, the period would have one of certain discrete values. Examining previous data, Brice-Olivier Demory as well as two colleagues in Seattle and Chicago were able to rule out all but one of those possible periods: 18.764 Earth days. "Remarkably, we found the planet in the Kepler data exactly where theory predicted", says Demory. So, if planet h orbits TRAPPIST-1 twice, its inner neighbour g completes 3 orbits, and f four.

"The fact that the period of TRAPPIST-1h was predicted by theory before it was found in the data reminds one of how Neptune was found more than 100 years ago", says CSH director Kevin Heng. Because of irregularities in the orbit of planet Uranus, astronomers predicted the existence of an additional planet further out and calculated the position of the unknown object - Neptune.

In addition to the period of TRAPPIST-1h, the scientists found that the temperature of the planet is 169 K, or -104 degrees Celsius and its radius is a bit smaller than the Earth radius. They also measured that the star itself rotates once every 3.3 days, and inferred from the low activity of TRAPPIST-1 that it is older than previously expected.

Once NASA had released the data, the researchers in Bern and their colleagues worked uninterrupted during 60 hours, analyzing the data and writing up the findings in a 37-page paper which is now being published in the journal Nature Astronomy. "Within our collaboration of 30 people, more than 450 emails were sent between all of us in just a few days", summarizes Brice-Olivier Demory: "At some point 15 people where simultaneously editing the online manuscript - a nice experience overall!"

Reference: Rodrigo Luger, Marko Sestovic, Ethan Kruse, Simon L. Grimm, Brice-Olivier Demory, Eric Agol, Emeline Bolmont, Daniel Fabrycky, Catarina S. Fernandes, Valerie Van Grootel, Adam Burgasser, Michael Gillon, James G. Ingalls, Emmanuel Jehin, Sean N. Raymond, Franck Selsis, Amaury H. M. J. Triaud, Thomas Barclay, Geert Barentsen, Steve B. Howell, Laetitia Delrez, Julien de Wit, Daniel Foreman-Mackey, Daniel L. Holdsworth, Jeremy Leconte, Susan Lederer, Martin Turbet, Yaseen Almleaky, Zouhair Benkhaldoun, Pierre Magain, Brett Morris, Kevin Heng and Didier Queloz: A seven-planet resonant chain in TRAPPIST-1, Nature Astronomy, 2017, 1, doi: 10.1038/s41550-017-0129

EXO WORLDS
Radio Detection of Lonely Planet Disk Shows Similarity with Stars
Heidelberg, Germany (SPX) May 19, 2017
A new study of the lonely, planet-like object OTS44 has provided evidence that this object has formed in a similar way as ordinary stars and brown dwarfs - a surprising result that challenges current models of star and planet formation. The study by a group of astronomers, led by Amelia Bayo of the University of Valparaiso and involving several astronomers from the Max Planck Institute for Astro ... read more

Related Links
Center for Space and Habitability
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only


Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

EXO WORLDS
First Year of BEAM Demo Offers Valuable Data on Expandable Habitats

Astronauts set to return after marathon ISS mission

NASA honors Kennedy's space vision on 100th birthday

Conch shells may inspire better helmets, body armor

EXO WORLDS
Lightning strike postpones SpaceX launch until Saturday

Dream Chaser Spacecraft Passes Major Milestone

NASA's Space Launch System Engine Testing Heats Up

Colossal rocket-launching plane rolls toward testing

EXO WORLDS
Halos discovered on Mars widen time frame for potential life

Student-Made Mars Rover Concepts Lift Off

Illinois Company Among Hundreds Supporting NASA Mission to Mars

Curiosity Peels Back Layers on Ancient Martian Lake

EXO WORLDS
California Woman Charged for Trying to Hand Over Sensitive Space Tech to China

A cabin on the moon? China hones the lunar lifestyle

China tests 'Lunar Palace' as it eyes moon mission

China to conduct several manned space flights around 2020

EXO WORLDS
New Horizons for Alexander Gerst

Propose a course idea for the CU space minor

Government space program spending reaches 62B dollars in 2016

Leading Global Air And Space Law Group Joins Reed Smith

EXO WORLDS
High pressure key to lighter, stronger metal alloys, Stanford scientists find

Northrop Grumman receives AESA radar contract

Space junk could destroy satellites, hurt economies

New method allows real-time monitoring of irradiated materials

EXO WORLDS
Russia thinks microorganisms may be living outside the space station

The race to trace TRAPPIST-1h

Giant Ringed Planet Likely Cause of Mysterious Eclipses

Viable Spores, DNA Fragments Discovery at ISS Justifies Biosphere's Expansion

EXO WORLDS
A whole new Jupiter with first science results from Juno

First results from Juno show cyclones and massive magnetism

Jupiters complex transient auroras

NASA's Juno probe forces 'rethink' on Jupiter









The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.