OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

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OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Sirius_Alpha on 3rd July 2014, 5:08 pm

A terrestrial planet in a ~1-AU orbit around one member of a ∼15-AU binary
http://www.sciencemag.org/content/345/6192/46

Using gravitational microlensing, we detected a cold terrestrial planet orbiting one member of a binary star system. The planet has low mass (twice Earth’s) and lies projected at ~0.8 astronomical units (AU) from its host star, about the distance between Earth and the Sun. However, the planet’s temperature is much lower, <60 Kelvin, because the host star is only 0.10 to 0.15 solar masses and therefore more than 400 times less luminous than the Sun. The host itself orbits a slightly more massive companion with projected separation of 10 to 15 AU. This detection is consistent with such systems being very common. Straightforward modification of current microlensing search strategies could increase sensitivity to planets in binary systems. With more detections, such binary-star planetary systems could constrain models of planet formation and evolution.

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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Led_Zep on 3rd July 2014, 6:37 pm

http://www.space.com/26436-rocky-exoplanet-single-star-binary-system.html

« …The planet's host star is about 0.11 to 0.14 times the sun's mass… »

A record for a planet’s host star ?
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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Sirius_Alpha on 4th July 2014, 12:15 pm

2MASS J04414489+2301513 has a mass of 0.02 Msol

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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Led_Zep on 5th July 2014, 7:11 am

2MASS J04414489+2301513  is a Brown dwarf, not OGLE-2013-BLG-0341L (I think...)



EDIT :
http://news.osu.edu/news/2014/07/03/planet-discovery-expands-search-for-earthlike-planets/

« …Three other planets have been discovered in binary systems that have similar separations, but using a different technique. This is the first one close to Earth-like size that follows an Earth-like orbit, and its discovery within a binary system by gravitational microlensing was by chance.
“Normally, once we see that we have a binary, we stop observing. The only reason we took such intensive observations of this binary is that we already knew there was a planet,” Gould said. “In the future we’ll change our strategy
.”.. »
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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Lazarus on 5th July 2014, 1:19 pm

Wait a minute, isn't the planet orbiting star B? Looks like the stars have been mislabelled.
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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Sirius_Alpha on 5th July 2014, 2:03 pm

It looks that way.

What is this distortion in the light curve they keep talking about in the article and how is it different from the usual gravitational microlensing light curve?

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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Led_Zep on 5th July 2014, 2:42 pm

"...The exoplanet in question has the alphabet soup name of OGLE-2013-BLG-0341LBb..."

yes, the picture is not correct
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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

Post by Sirius_Alpha on 6th July 2014, 8:36 pm

Now on arXiv.
A Terrestrial Planet in a ~1 AU Orbit Around One Member of a ~15 AU Binary
http://arxiv.org/abs/1407.1115

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Re: OGLE-2013-BLG-0341L - A terrestrial planet at 1 AU from an M dwarf star in a binary system

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