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Upsilon Andromedae System

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Exoplanetary Scratchpad

[SysBP Img]

A nearby (44 ly) multi-star system which is the first multiplanet system found around a main sequence star. The main star around which the planets orbit is a yellow-white star somewhat younger than the sun and its companion is a red dwarf in a wide orbit. It is one of the most well studied non-transiting star systems. Roaster Planet b (0.05 au, 1.4 MJ, e=0.013) is nicknamed the Fire and Ice Planet because it is hot on one side and cold on the other. The hottest parts of the planet are near the trailing side terminator at the equator, due to high velocity winds transporting heat to the night side. This is 80deg offset from the starward pole and a much greater offset than other observed hot Jupiters. This threw astronomers off and caused them to doubt the wind-theory, though later observations of other planets have shown that winds indeed can travel fast enough to cause this. The middle planets c (0.83 au, 14 MJ, may actually be a brown dwarf star, e=0.224) and d (2.5 au, 10 MJ, e=0.26) have had their inclinations and masses determined with astrometry. They are very eccentric and highly inclined to each other (30 deg). Planet scattering was thought to be a source until the outermost planet was discovered. This is planet e (5.2 au, 1.05 MJ, e = 0.005), which is the most Jupiter-like exoplanet known, and is in 3:1 resonance with planet d. The star appears to have no Kuiper-belt like disc, perhaps due to its companion star sweeping away this material.

Upsilon Andromedae System Web Pages

Upsilon Andromedae System In the News

Planet b Discovered (1996)

http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v474n2/5590/5590.html

Planet b Studies (1996-2005)

http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v548n1/51961/brief/51961.abstract.html (2000) tidal influences http://physicsweb.org/articles/world/14/1/7/2 (2001) - clouds and atmosphere http://www.aas.org/publications/baas/v35n5/aas203/986.htm (2003) - magnetic interaction with Star http://fr.arxiv.org/abs/astro-ph/0411655 (2004) - effect on Star http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v632n2/60622/brief/60622.abstract.html (2005) - origin and physical history http://www.edpsciences.org/articles/aa/abs/2005/18/aa1680/aa1680.html (2005) - Effects of Stellar Winds

Planet c and d Discovered (1999)

http://cfa-www.harvard.edu/afoe/upsAnd_pr.html http://cfa-www.harvard.edu/afoe/overview.html http://www.nytimes.com/library/national/science/041699sci-solar-system.html http://news.bbc.co.uk/1/hi/sci/tech/319865.stm http://www.cnn.com/TECH/space/9904/15/new.solar.system/index.html http://science.nasa.gov/newhome/headlines/ast15apr99_1.htm http://www.boston.com/news/daily/15/solar_system.htm http://www.washingtonpost.com/wp-srv/national/daily/april99/planets041699.htm http://astronomy.swin.edu.au/sao/guest/butler/ http://www.ast.cam.ac.uk/AAO/press/multipleplanets.html http://www.salon.com/books/it/1999/04/21/solar_system/ http://www.badastronomy.com/bitesize/ups_and.html

Entire System Extrapolated From Planet d (1999)

http://fr.arxiv.org/abs/astro-ph/9910534 (1999)

No Circumstellar Disk Found (1999)

http://www.aas.org/publications/baas/v31n4/dps99/447.htm

System Stability (1999-2004)

http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v530n1/40532/brief/40532.abstract.html (1999) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v545n2/51250/brief/51250.abstract.html (2000) http://www.aas.org/publications/baas/v32n3/dps2000/122.htm (2000) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v550n2/52104/brief/52104.abstract.html (2000) http://www.aas.org/publications/baas/v36n4/dps2004/489.htm (2004)

Mass Estimation (1999-2001)

http://fr.arxiv.org/abs/astro-ph/9907175 (1999) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v552n1/53231/brief/53231.abstract.html (2000) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v548n1/005774/brief/005774.abstract.html (2001)

Dynamic Origin (1999-2001)

http://www.aas.org/publications/baas/v33n3/dda2001/40.htm (2001)

Apsidal Alignment (2001-2002)

http://www.journals.uchicago.edu/AJ/journal/issues/v122n3/201166/brief/201166.abstract.html (2001) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v576n1/16282/brief/16282.abstract.html (2002) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v575n1/16411/brief/16411.abstract.html (2002)

Water MASER Detected (2002)

http://www.newscientist.com/article.ns?id=dn2810 http://www.spaceref.com/news/viewnews.html?id=667

Star B Discovered (2002)

http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v572n1/16280/brief/16280.abstract.html

Star-B and Dynamics (2002)

http://www.gl.ciw.edu/interns/2002/Norwood_abstract.html http://www.aas.org/publications/baas/v34n3/dps2002/202.htm http://fr.arxiv.org/abs/astro-ph/0210438

Origin of Eccentric Planets (2002-2005)

http://fr.arxiv.org/abs/astro-ph/0205104 (2002) http://fr.arxiv.org/abs/astro-ph/0503593 (2005)

Hubble Astrometric Studies (2003)

http://www.aas.org/publications/baas/v35n4/dps2003/87.htm (2003)

Theoretical Disk Structure (2003)

http://www.aas.org/publications/baas/v35n4/dps2003/451.htm

Search for Radio Emissions (2004-2005)

http://fr.arxiv.org/abs/astro-ph/0410600 (2004) http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005AGUSM.P21E..03M&db_key=AST&high=41f529900e17088 (2005) http://www.aas.org/publications/baas/v37n4/aas207/1101.htm (2005) http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005AGUFMSA53B1181W&db_key=AST&data_type=HTML&format=&high=41f529900e02738 (2005) http://rp.iszf.irk.ru/hawk/URSI2005/pdf/J03b.4(01189).pdf

Stattered Planet? (2004-2005)

The eccentricity of the outer planets is likely due to a giant planet that was ejected from the star system. http://arxiv.org/abs/astro-ph/0502441 http://www.astro.northwestern.edu/rasio/UpsAndPR/ http://www.nsf.gov/news/news_videos.jsp?cntn_id=103188&media_id=54488&org=NSF http://www.astronomy.com/asy/default.aspx?c=a&id=3060 http://www.theallineed.com/science/05042612.htm http://www.berkeley.edu/news/media/releases/2005/04/13_planet.shtml http://www.eurekalert.org/pub_releases/2005-04/nu-msh041105.php

Habitability Studies (2004)

http://www.ifa.hawaii.edu/reu/2005research/dove.pdf (2004)

Planet b Found to Be Half Hot Half Cold (2006)

http://www.space.com/scienceastronomy/061012_fireice_planet.html
http://www.tucsoncitizen.com/daily/local/29272.php
http://www.upi.com/NewsTrack/Science/2006/10/13/planet_temps_beyond_solar_system_recorded/
http://www.carnegieinstitution.org/exoplanet_weather/
http://www.eurekalert.org/pub_releases/2006-10/uocf-uua101206.php
http://www.timesonline.co.uk/tol/news/world/article599654.ece
http://www.space.com/scienceastronomy/061012_fireice_planet.html
http://www.nasa.gov/home/hqnews/2006/oct/HQ_06334_spitzer_temps.html
http://www.astronomy.com/asy/default.aspx?c=a&id=4578

Outer Planets Found to be Tilted 30degrees (2010)

Mysterious Hot Spot on Planet b (Oct 2010)

Jupiter Analog e Discovered (2010)

Model Using HD 209458 Data Explains Wind Source of Offset Hot Spots (2011)

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