Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



EXO WORLDS
New prediction of a detection wavelength for searching phototrophs on exoplanets
by Staff Writers
Tokyo, Japan (SPX) Sep 13, 2017


Artists impressions of a habitable planet around M-dwarfs (left) and primordial Earth (right). The surface of M-dwarf planet is illuminated by visible light. On the other hand, similar light conditions are expected underwater, since only blue-green light can penetrate meters of water.

M-dwarfs or red dwarfs are small (0.5-0.1 solar-masses) and cool ( ~3000 Kelvin) stars, and are abundant in universe. The Sun-like stars have been attracting most attention as a plausible target for searching habitable exoplanets. However, nearby M-dwarfs are becoming the most extensive targets for habitable planet searches because they are the most abundant nearby stars and thus could be the first candidate for detecting any biosignatures on exoplanets via transit or direct imaging observations in near future.

One of the most important exoplanetary biosignatures is a specific reflection pattern on the land surface named 'red-edge', which is caused by vegetation such as forests and grasslands. On the Earth, red-edge appears between red and infrared (IR) wavelengths, since red-light is absorbed for photosynthesis while IR radiation is reflected.

In previous studies, it was predicted that red-edge position on exoplanets should be decided by the radiation spectrum by nearby stars. Around M-dwarfs, red-edge was expected to be shifted to a longer wavelength, since planets on the exoplanets use abundant IR radiation for photosynthesis.

Researchers at the Astrobiology Center (ABC) of National Institutes of Natural Science (NINS) in Japan and their colleagues have proposed and alternative prediction that red-edge could be observed as on the Earth even on exoplanets around M-dwarfs in the online journal Scientific Reports on August 8th, 2017.

They pointed out that the first oxgenic photorophs are most likely to have evolved underwater to utilize visible light just like what had happened in the primordial ocean on the Earth.

They examined light adaptation mechanisms of visible- and IR-radiation-using phototrophs required for adapting to land habitats and found out that IR-using phototrophs struggle to adapt to changing light condition at the boundary of water and land surface.

Kenji Takizawa, read author of the study, said "It is too risky to utilize IR-radiation during water-to-land evolution."

If phototrophs keep their photosynthetic apparatus for landing, the red-edge position of the land surface on M-dwarf planets show just like as on the Earth, at the initial stage of land vegetation. Therefor, non-shifted red-edge should be kept in mind for searching habitable planets around M-dwarfs and perparation of such biosignature-hunting instruments.

EXO WORLDS
NASA Team Passes Major Technological Milestone for Characterizing Exoplanets
Greenbelt MD (SPX) Sep 11, 2017
NASA researchers say they have passed a major milestone in their quest to mature more powerful tools for directly detecting and analyzing the atmospheres of giant planets outside the solar system - one of the observational goals of NASA's proposed Wide-Field Infrared Space Telescope, also known as WFIRST. In tests conducted at the High-Contrast Imaging Testbed at NASA's Jet Propulsion Labo ... read more

Related Links
National Astronomical Observatory of Japan
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
Diet tracker in space

Three astronauts blast off for five-month ISS mission

Crewed Missions Beyond LEO

Voyager Spacecraft: 40 Years of Solar System Discoveries

EXO WORLDS
SLS Core Stage Simulator Will Pave Way for Mission Success

Arianespace announces a new contract, bringing its order book to 53 launches across three rockets

EUMETSAT signs with Arianespace for first Metop-SG satellite launch

MHI to launch first Inmarsat-6 satellite

EXO WORLDS
45 Kilometers on the Odometry for Opportunity

New tools for exploring the surface of Mars

NASA's Curiosity Mars Rover Climbing Toward Ridge Top

New Gravity Map Suggests Mars Has a Porous Crust

EXO WORLDS
Spacecraft passes docking test

China, Russia to Have Smooth Space Cooperation, Says Expert

Kuaizhou-11 to send six satellites into space

Russia, China May Sign 5-Year Agreement on Joint Space Exploration

EXO WORLDS
India, Japan Set to Boost Space Cooperation

Bids for government funding prove strong interest in LaunchUK

Blue Sky Network Reaffirms Commitment to Brazilian Market

India to Launch Exclusive Satellite for Afghanistan

EXO WORLDS
Dormant, Yet Always-Alert Sensor Awakes Only in the Presence of a Signal of Interest

Air Force activates new satellites for tracking space objects

'Peel-and-go' printable structures fold themselves

Ultrathin spacecraft will collect, deposit orbital debris

EXO WORLDS
Hubble observes pitch black planet

The return of the comet-like exoplanet

Does the Organic Material of Comets Predate our Solar System?

X-rays Reveal Temperament of Possible Planet-hosting Stars

EXO WORLDS
Hibernation Over, New Horizons Continues Kuiper Belt Cruise

Pluto features given first official names

Jupiter's Auroras Present a Powerful Mystery

New Horizons Files Flight Plan for 2019 Flyby




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - 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. Privacy Statement