First exposed planetary core discovered allows glimpse inside other
worlds

Date:
July 1, 2020
Source:
University of Warwick
Summary:
The surviving core of a gas giant has been discovered orbiting a
distant star, offering an unprecedented glimpse into the interior
of a planet.



FULL STORY ==========================================================================
The surviving core of a gas giant has been discovered orbiting a distant
star by University of Warwick astronomers, offering an unprecedented
glimpse into the interior of a planet.


==========================================================================
The core, which is the same size as Neptune in our own solar system,
is believed to be a gas giant that was either stripped of its gaseous atmosphere or that failed to form one in its early life.

The team from the University of Warwick's Department of Physics reports
the discovery today (1 July) in the journal Nature, and is thought to
be the first time the exposed core of a planet has been observed.

It offers the unique opportunity to peer inside the interior of a planet
and learn about its composition.

Located around a star much like our own approximately 730 light years
away, the core, named TOI 849 b orbits so close to its host star that
a year is a mere 18 hours and its surface temperature is around 1800K.

TOI 849 b was found in a survey of stars by NASA's Transiting Exoplanet
Survey Satellite (TESS), using the transit method: observing stars
for the tell-tale dip in brightness that indicates that a planet has
passed in front of them. It was located in the 'Neptunian desert' --
a term used by astronomers for a region close to stars where we rarely
see planets of Neptune's mass or larger.



==========================================================================
The object was then analysed using the HARPS instrument, on a program led
by the University of Warwick, at the European Southern Observatory's La
Silla Observatory in Chile. This utilises the Doppler effect to measure
the mass of exoplanets by measuring their 'wobble' -- small movements
towards and away from us that register as tiny shifts in the star's
spectrum of light.

The team determined that the object's mass is 2-3 times higher than
Neptune but it is also incredibly dense, with all the material that
makes up that mass squashed into an object the same size.

Lead author Dr David Armstrong from the University of Warwick Department
of Physics said: "While this is an unusually massive planet, it's a long
way from the most massive we know. But it is the most massive we know for
its size, and extremely dense for something the size of Neptune, which
tells us this planet has a very unusual history. The fact that it's in
a strange location for its mass also helps -- we don't see planets with
this mass at these short orbital periods.

"TOI 849 b is the most massive terrestrial planet -- that has an earth
like density -- discovered. We would expect a planet this massive to
have accreted large quantities of hydrogen and helium when it formed,
growing into something similar to Jupiter. The fact that we don't see
those gases lets us know this is an exposed planetary core.

"This is the first time that we've discovered an intact exposed core of
a gas giant around a star." There are two theories as to why we are
seeing the planet's core, rather than a typical gas giant. The first
is that it was once similar to Jupiter but lost nearly all of its outer
gas through a variety of methods. These could include tidal disruption,
where the planet is ripped apart from orbiting too close to its star,
or even a collision with another planet. Large-scale photoevaporation
of the atmosphere could also play a role, but can't account for all the
gas that has been lost.



========================================================================== Alternatively, it could be a 'failed' gas giant. The scientists believe
that once the core of the gas giant formed then something could have
gone wrong and it never formed an atmosphere. This could have occurred
if there was a gap in the disc of dust that the planet formed from,
or if it formed late and the disc ran out of material.

Dr Armstrong adds: "One way or another, TOI 849 b either used to be a
gas giant or is a 'failed' gas giant.

"It's a first, telling us that planets like this exist and can be
found. We have the opportunity to look at the core of a planet in a
way that we can't do in our own solar system. There are still big open questions about the nature of Jupiter's core, for example, so strange
and unusual exoplanets like this give us a window into planet formation
that we have no other way to explore.

"Although we don't have any information on its chemical composition
yet, we can follow it up with other telescopes. Because TOI 849 b is so
close to the star, any remaining atmosphere around the planet has to be constantly replenished from the core. So if we can measure that atmosphere
then we can get an insight into the composition of the core itself."

========================================================================== Story Source: Materials provided by University_of_Warwick. Note: Content
may be edited for style and length.


========================================================================== Journal Reference:
1. David J. Armstrong, The'o A. Lopez, Vardan Adibekyan, Richard
A. Booth,
Edward M. Bryant, Karen A. Collins, Magali Deleuil, Alexandre
Emsenhuber, Chelsea X. Huang, George W. King, Jorge Lillo-Box,
Jack J. Lissauer, Elisabeth Matthews, Olivier Mousis, Louise
D. Nielsen, Hugh Osborn, Jon Otegi, Nuno C. Santos, Se'rgio
G. Sousa, Keivan G. Stassun, Dimitri Veras, Carl Ziegler, Jack
S. Acton, Jose M. Almenara, David R. Anderson, David Barrado,
Susana C. C. Barros, Daniel Bayliss, Claudia Belardi, Francois
Bouchy, Ce'sar Bricen~o, Matteo Brogi, David J. A. Brown, Matthew
R. Burleigh, Sarah L. Casewell, Alexander Chaushev, David R.

Ciardi, Kevin I. Collins, Knicole D. Colo'n, Benjamin F. Cooke,
Ian J. M.

Crossfield, Rodrigo F. Di'az, Elisa Delgado Mena, Olivier D. S.

Demangeon, Caroline Dorn, Xavier Dumusque, Philipp Eigmu"ller,
Michael Fausnaugh, Pedro Figueira, Tianjun Gan, Siddharth Gandhi,
Samuel Gill, Erica J. Gonzales, Michael R. Goad, Maximilian
N. Gu"nther, Ravit Helled, Saeed Hojjatpanah, Steve B. Howell, James
Jackman, James S. Jenkins, Jon M. Jenkins, Eric L. N. Jensen, Grant
M. Kennedy, David W. Latham, Nicholas Law, Monika Lendl, Michael
Lozovsky, Andrew W. Mann, Maximiliano Moyano, James McCormac,
Farzana Meru, Christoph Mordasini, Ares Osborn, Don Pollacco,
Didier Queloz, Liam Raynard, George R. Ricker, Pamela Rowden,
Alexandre Santerne, Joshua E. Schlieder, Sara Seager, Lizhou Sha,
Thiam-Guan Tan, Rosanna H. Tilbrook, Eric Ting, Ste'phane Udry,
Roland Vanderspek, Christopher A. Watson, Richard G. West, Paul
A. Wilson, Joshua N. Winn, Peter Wheatley, Jesus Noel Villasenor,
Jose I. Vines, Zhuchang Zhan. A remnant planetary core in the
hot-Neptune desert.

Nature, 2020; 583 (7814): 39 DOI: 10.1038/s41586-020-2421-7 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/07/200701125438.htm

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