The Astronomical Society of the Toms River Area
ASTRA club message board

It is currently Tue Nov 21, 2017 6:52 am

All times are UTC - 5 hours


Forum rules


This message board is for A.S.T.R.A. Members and visiting Guests. Astronomical and Star Party messages are welcome. Those who post are responsible for their content. The board is monitored by the Webmaster, who has the discretion to remove any posts. The Webmaster is accountable to the club officers. Please follow responsible message board etiquette.



Post new topic Reply to topic  [ 64 posts ]  Go to page Previous  1, 2, 3
Author Message
PostPosted: Tue Oct 24, 2017 10:32 am 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Possible exomoon may be an ocean-covered world as big as Saturn

https://www.newscientist.com/article/21 ... as-saturn/

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Fri Oct 27, 2017 6:07 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Planet Formation in Cometary Rings

https://www.centauri-dreams.org/?p=38647

Quote:
What the scientists are finding is that dense rings of comets can become a construction zone for planets of super-Earth size. The makeup of the material in these ring systems varies, from two that are rich in ice (Fomalhaut and HD 32297) to one that is depleted in ice but rich in carbon (HR 4796A). Take a look at the image below, showing the ring surrounding HR 4796A, and you’ll see how strikingly tight the band of dust around this relatively young stellar system is.


Attachments:
star.jpg
star.jpg [ 165.6 KiB | Viewed 118 times ]

_________________
Interdum taurus est victor

Chris S.
Top
 Profile  
 
PostPosted: Mon Oct 30, 2017 2:29 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Comets Detected Outside Our Solar System for the First Time

http://www.newsweek.com/comets-detected ... ime-696446

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Tue Oct 31, 2017 7:11 am 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Astronomers Spy Planet-Spawning Vortex around Young Star

https://www.scientificamerican.com/arti ... oung-star/

Quote:
Deeper glimpses into protoplanetary disks shed light on how planets are born

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Wed Nov 01, 2017 1:10 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
‘Monster’ Planet Discovery Challenges Formation Theory

http://www.astrowatch.net/2017/11/monst ... enges.html

Quote:
Its existence challenges theories of planet formation which state that a planet of this size could not be formed by such a small star. According to these theories, small stars can readily form rocky planets but do not gather enough material together to form Jupiter-sized planets.

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Fri Nov 03, 2017 2:43 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
The 20 Possibly Habitable Exoplanets Where We Might Find Alien Life

https://www.outerplaces.com/science/ite ... eti-aliens

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Mon Nov 06, 2017 7:54 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Astronomers Use Shadowy Alien Worlds to Peer Inside Stars

https://www.scientificamerican.com/arti ... ide-stars/

Quote:
New analyses allow scientists to measure stellar densities using orbiting planets


and...

Scientists: Water worlds exoplanets not live longer than 1 billion years

https://theqtimes.com/scientists-water- ... -years/597

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Tue Nov 07, 2017 11:39 am 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Extremely massive exoplanet discovered in the Milky Way's bulge

https://phys.org/news/2017-11-extremely ... bulge.html

Quote:
According to the study, OGLE-2016-BLG-1190Lb appears to be an extremely massive planet with a mass of about 13.4 Jupiter masses. Such high mass puts the object right at the deuterium burning limit—the conventional boundary between planets and brown dwarfs. Therefore, the researchers do not exclude the possibility that the newly found planet could be a low-mass brown dwarf.

OGLE-2016-BLG-1190Lb orbits its parent star approximately every three years at a distance of about 2.0 AU. The host is a G dwarf with a mass of 0.89 solar masses. The system is located some 22,000 light years away from the Earth.


Is that a planet in your bulge, or are you just happy to see me?

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Tue Nov 07, 2017 11:46 am 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
The first evidence of planets around another star was found in… 1917?

http://www.syfy.com/syfywire/the-first- ... s-found-in…-1917

Quote:
In that year of 1917, the Dutch-American astronomer Adrian van Maanen published a short paper announcing the discovery of two different stars with "high proper motion"; that is, stars that appear to be moving across the sky with faster than normal speed. He had actually taken a glass photographic plate of a different star for a different reason, but when he compared it to an older plate taken of the same part of the sky he noticed that a very faint star in the field had noticeably moved.

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Tue Nov 07, 2017 2:19 pm 
Offline
User avatar

Joined: Thu Oct 13, 2011 12:53 pm
Posts: 209
Location: Maple Shade, NJ
BetaDraconis wrote:
The first evidence of planets around another star was found in… 1917?

http://www.syfy.com/syfywire/the-first- ... s-found-in…-1917

Quote:
In that year of 1917, the Dutch-American astronomer Adrian van Maanen published a short paper announcing the discovery of two different stars with "high proper motion"; that is, stars that appear to be moving across the sky with faster than normal speed. He had actually taken a glass photographic plate of a different star for a different reason, but when he compared it to an older plate taken of the same part of the sky he noticed that a very faint star in the field had noticeably moved.

The link above is dysfunctional, it should be...

[url]http://www.syfy.com/syfywire/the-first-evidence-of-planets-around-another-star-was-found-in…-1917[/url]

However, trying to make it a hotlink doesn't work, apparently because the message board software doesn't like or recognize the ellipsis near the end of the URL (the ellipsis being the three dots near the end; it's actually a single character, not three individual dots, periods or decimal points). You'll just have to copy-and-paste the text highlighted in bronze color.

And the quote may be somewhat misleading, as it seems to imply that the movement of the faint star in itself indicated a planet. But that's because it's out of context. The full story goes on describe how the spectrum of that star taken back then, with modern analysis, shows "the chemical composition of the material seen in the white dwarf spectrum matches that of asteroids in our own solar system."

_________________
Joe Stieber
http://sjastro.org/
Image


Top
 Profile  
 
PostPosted: Mon Nov 13, 2017 12:13 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Exoplanets Lurking in Dusty Disks Reveal Their Secrets

https://www.scientificamerican.com/arti ... r-secrets/

Quote:
A new mathematical model suggests planets interact with these structures in complex ways


Curious as to why this wouldn't be evident since we have two ringed planets in our solar system with signifcant, natural satellites. Wouldn't Jupiter and Saturn be models for stellar disks of dust?

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 7:46 am 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
Eleven Light-Years Away, an Earth-Size Planet That May Be Habitable

https://www.nytimes.com/2017/11/15/scie ... s-128.html

C'mon gang! We're goin' to Ross 128 for December's meeting!

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
PostPosted: Wed Nov 15, 2017 2:18 pm 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
A Visual Guide to the Search for Exoplanets

https://blogs.scientificamerican.com/sa ... xoplanets/


Attachments:
info.png
info.png [ 379.69 KiB | Viewed 30 times ]

_________________
Interdum taurus est victor

Chris S.
Top
 Profile  
 
PostPosted: Thu Nov 16, 2017 9:35 am 
Offline
User avatar

Joined: Sun Nov 13, 2011 4:39 pm
Posts: 1569
Location: Gilford Park
A Case for an Atmosphere on Super-Earth 55 Cancri e

http://iopscience.iop.org/article/10.38 ... a9278/meta

Quote:
The phase curve of 55 Cancri e is dominated by thermal emission with an eastward-shifted hotspot. We determine the heat redistribution efficiency to be ${1.47}_{-0.25}^{+0.30}$, which implies that the advective timescale is on the same order as the radiative timescale. This requirement cannot be met by the bare-rock planet scenario because heat transport by currents of molten lava would be too slow. The phase curve thus favors the scenario with a substantial atmosphere.

_________________
Interdum taurus est victor

Chris S.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 64 posts ]  Go to page Previous  1, 2, 3

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
POWERED_BY