View source for TrES-1b

{{Short description|Hot Jupiter orbiting TrES-1 in the constellation of Lyra}}
{{Infobox planet
| name                     = TrES-1b
| image                    = Exoplanet Comparison TrES-1 b.png
| caption                  = Size comparison of TrES-1 with Jupiter.
<!-- DISCOVERY           -->
| discovery_ref = <ref name="Keck press release"/><ref name="Alonso2004"/>
| discoverer = [[Trans-Atlantic Exoplanet Survey|TrES]]
| discovery_site = [[Teide Observatory]], [[Lowell Observatory]], [[Palomar Observatory]]
| discovered = 24 August 2004
| discovery_method = [[Astronomical transit|Transit]]
<!-- DESIGNATIONS        -->
<!-- ORBITAL             --> 
| apsis                    = astron
| semimajor                = {{val|0.03926|0.00058|0.00060}} [[astronomical unit|AU]]
| eccentricity             = {{val|0.012|p=<}}<ref name="Bonomo2017"/>
| period                   = {{val|3.03006973|0.00000018}}<ref name="Baluev2015"/> [[day|d]]
| inclination              = 88.2 ± 1
| semi-amplitude           = {{val|106.7|2.9|2.8}}<ref name="Bonomo2017"/>
| star                     = [[GSC 02652-01324]]
<!-- PHYS CHARS          --> 
| mean_radius              = 1.081<sup>+0.18</sup><sub>−0.04</sub> {{Jupiter radius|link=y}}
| mass                     = {{val|0.697|0.028|0.027}}<ref name="Bonomo2017"/> {{Jupiter mass|link=y}}
| density                  = {{cvt|642|kg/m3|g/cm3|lk=on|disp=out}}{{fact|date=July 2024}}
| surface_grav             = 0.52 [[g-force|g]]
| single_temperature       = 1,060 ± 50
<!-- ATMOSPHERE          --> 
<!-- NOTES               --> 
}}
'''TrES-1b''' is an [[extrasolar planet]] approximately 523 [[light-year]]s away in the [[constellation]] of [[Lyra]] (the [[Lyre]]). The planet's [[mass]] and [[radius]] indicate that it is a [[Jovian planet]] with a similar bulk composition to [[Jupiter]]. Unlike Jupiter, but similar to many other planets detected around other stars, TrES-1 is located very close to its star, and belongs to the class of planets known as [[hot Jupiter]]s. The planet was discovered orbiting around [[GSC 02652-01324]] (an [[orange dwarf]] star).

==Detection and discovery==
TrES-1b was discovered by the [[Trans-Atlantic Exoplanet Survey]] by detecting the [[Astronomical transit|transit]] of the planet across its parent star using a {{convert|4|in|mm|adj=mid|-diameter}} telescope. The discovery was confirmed by the [[Keck Observatory]] using the [[Doppler spectroscopy|radial velocity method]], which allowed its mass to be determined.<ref name="Alonso2004"/>

===Transit===
On March 22, 2005, Astronomers using [[NASA]]'s [[Spitzer Space Telescope]] took advantage of this fact to directly capture the infrared light of two previously detected planets orbiting outside the [[Solar System]]. Their findings revealed the temperatures and orbits of the planets.

[[Image:Ssc2005-09b.jpg|thumb|left|200px|Eclipse of TrES-1 in visible and [[infrared]] light (artist's conception)]]

Upcoming ''Spitzer'' observations using a variety of infrared wavelengths may provide more information about the planets' winds and atmospheric compositions. It enabled determination of TrES-1's [[temperature]], which is in excess of 1000 [[Kelvin|K]] (1340 [[Fahrenheit|°F]]). The planet's [[albedo|Bond albedo]] was found to be 0.31 ± 0.14.<ref>{{cite journal | author=Charbonneau | title=Detection of Thermal Emission from an Extrasolar Planet | journal=The Astrophysical Journal | volume=626 | date=2005 | pages=523–529 | doi=10.1086/429991 | last2=Allen | first2=Lori E. |author2-link=Lori Allen (astronomer)| last3=Megeath | first3=S. Thomas | last4=Torres | first4=Guillermo | last5=Alonso | first5=Roi | last6=Brown | first6=Timothy M. | last7=Gilliland | first7=Ronald L. | last8=Latham | first8=David W. | last9=Mandushev | first9=Georgi | last10=o’Donovan | first10=Francis T. | last11=Sozzetti | first11=Alessandro | bibcode=2005ApJ...626..523C|arxiv = astro-ph/0503457 | issue=1| s2cid=13296966 | display-authors=8 }}</ref>

In the [[infrared]] panel, the colors reflect what our eyes might see if we could retune them to the invisible, infrared portion of the light spectrum. The hot star is less bright in infrared light than in visible and appears fainter. The warm planet peaks in infrared light, so is shown brighter. Their hues represent relative differences in temperature. Because the star is hotter than the planet, and because hotter objects give off more blue light than red, the star is depicted in blue, and the planet, red.

The overall look of the planet is inspired by theoretical models of hot, gas giant planets. These "hot Jupiters" are similar to Jupiter in composition and mass, but are expected to look quite different at such high temperatures.

===Radial velocity===
The [[Methods of detecting exoplanets#Transit photometry|transit light-curve signature]] in the course of the TrES multi-site transiting planet survey, and confirmed the planetary nature of the companion via multicolor photometry and precise [[radial velocity]] measurements.<ref name="Keck press release"/><ref name="Alonso2004"/> With this, the planet has an orbital period similar to that of [[HD 209458 b]], but about twice as long as those of the [[Optical Gravitational Lensing Experiment]] (OGLE) transiting planets. Its mass is similar to that of HD 209458 b, but its radius is significantly smaller and fits the theoretical models without the need for an additional source of heat deep in the atmosphere, as has been invoked by some investigators for HD 209458 b.

{{clear left}}

==Rotation==
The spin-orbit angle using the [[Rossiter–McLaughlin effect]]<ref>{{Cite journal| title= Measuring accurate transit parameters | journal=Proceedings of the International Astronomical Union | volume=4 | pages=99–109 | author=Joshua N. Winn | arxiv=0807.4929 |date=2008| doi=10.1017/S174392130802629X | bibcode=2009IAUS..253...99W | s2cid=34144676 }}</ref> was measured to be +30{{±|21}}° in 2007.<ref>{{cite journal
| title=Measurement of the Rossiter-McLaughlin Effect in the Transiting Exoplanetary System TrES-1
| author=Narita
| display-authors=etal
| url=http://pasj.asj.or.jp/v59/n4/590411/590411.pdf
| journal=[[Publications of the Astronomical Society of Japan]]
| issue=4
| pages=763–770
| date= August 25, 2007 | volume=59
| doi=10.1093/pasj/59.4.763
| arxiv=astro-ph/0702707
| bibcode=2007PASJ...59..763N
| s2cid=15033371
}}</ref>

==Physical characteristics==
Hubble might find water in TrES-1, and it would give a much more precise measurement of the planet's size, and even allow us to search for moons. A satellite is unlikely however, given the likely history and current orbital configuration for the planet, the research team concluded.

There are only 11 [[exomoon]] candidates around 8 exoplanets, but some researchers have considered that such satellites would be logical places for life to exist around giant gaseous worlds that otherwise could not be expected to support biology.

Models indicate that TrES-1 has undergone significant tidal heating in the past due to its eccentric orbit, but this does not appear to have inflated the planet's radius.<ref>{{cite journal
| title=Tidal Heating of Extra-Solar Planets
| author= Jackson
| journal=The Astrophysical Journal
| volume=681
| issue=2
| pages=1631–1638
| doi=10.1086/587641
| date= July 10, 2008
| last2=Greenberg
| first2=Richard
| last3=Barnes
| first3=Rory
| bibcode=2008ApJ...681.1631J|arxiv = 0803.0026 | s2cid= 42315630
}}</ref>

==See also==
* [[Trans-Atlantic Exoplanet Survey]]
* [[51 Pegasi b]]
* [[HD 209458 b]]
* [[Hot Jupiter]]
* [[TrES-2b]]

==References==
{{Reflist|refs=

<ref name="Alonso2004">{{cite journal | title=TrES-1: The Transiting Planet of a Bright K0V Star | last1=Alonso | first1=Roi | last2=Brown | first2=Timothy M. | last3=Torres | first3=Guillermo | last4=Latham | first4=David W. | last5=Sozzetti | first5=Alessandro | last6=Mandushev | first6=Georgi | last7=Belmonte | first7=Juan A. | last8=Charbonneau | first8=David | last9=Deeg | first9=Hans J. | last10=Dunham | first10=Edward W. | last11=O'Donovan | first11=Francis T. | last12=Stefanik | first12=Robert P. | display-authors=1 | journal=The Astrophysical Journal Letters | date=2004 | volume=613 | issue=2 | pages=L153–L156 | arxiv=astro-ph/0408421 | bibcode=2004ApJ...613L.153A | doi=10.1086/425256 | s2cid=8940599 }}</ref>

<ref name="Baluev2015">{{cite journal | title=Benchmarking the power of amateur observatories for TTV exoplanets detection | last1=Baluev | first1=Roman V. | last2=Sokov | first2=Evgenii N. | last3=Shaidulin | first3=Vakhit Sh. | last4=Sokova | first4=Iraida A. | last5=Jones | first5=Hugh R. A. | last6=Tuomi | first6=Mikko | last7=Anglada-Escudé | first7=Guillem | last8=Benni | first8=Paul | last9=Colazo | first9=Carlos A. | last10=Schneiter | first10=Matias E. | last11=d'Angelo | first11=Carolina S. Villarreal | last12=Burdanov | first12=Artem Yu | last13=Fernández-Lajús | first13=Eduardo | last14=Baştürk | first14=Özgür | last15=Hentunen | first15=Veli-Pekka | last16=Shadick | first16=Stan | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=450 | issue=3 | pages=3101–3113 | year=2015 | arxiv=1501.06748 | bibcode=2015MNRAS.450.3101B | doi=10.1093/mnras/stv788 | doi-access=free | s2cid=15420110 }}</ref>

<ref name="Bonomo2017">{{cite journal | title=The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets | url=https://www.aanda.org/articles/aa/full_html/2017/06/aa29882-16/aa29882-16.html | last1=Bonomo | first1=A. S. | last2=Desidera | first2=S. | last3=Benatti | first3=S. | last4=Borsa | first4=F. | last5=Crespi | first5=S. | last6=Damasso | first6=M. | last7=Lanza | first7=A. F. | last8=Sozzetti | first8=A. | last9=Lodato | first9=G. | last10=Marzari | first10=F. | last11=Boccato | first11=C. | last12=Claudi | first12=R. U. | last13=Cosentino | first13=R. | last14=Covino | first14=E. | last15=Gratton | first15=R. | last16=Maggio | first16=A. | last17=Micela | first17=G. | last18=Molinari | first18=E. | last19=Pagano | first19=I. | last20=Piotto | first20=G. | last21=Poretti | first21=E. | last22=Smareglia | first22=R. | last23=Affer | first23=L. | last24=Biazzo | first24=K. | last25=Bignamini | first25=A. | last26=Esposito | first26=M. | last27=Giacobbe | first27=P. | last28=Hébrard | first28=G. | last29=Malavolta | first29=L. | last30=Maldonado | first30=J. | last31=Mancini | first31=L. | last32=Martinez Fiorenzano | first32=A. | last33=Masiero | first33=S. | last34=Nascimbeni | first34=V. | last35=Pedani | first35=M. | last36=Rainer | first36=M. | last37=Scandariato | first37=G. | display-authors=1 | journal=Astronomy and Astrophysics | volume=602 | at=A107 | year=2017 | arxiv=1704.00373 | bibcode=2017A&A...602A.107B | doi=10.1051/0004-6361/201629882 | s2cid=118923163 }}</ref>

<ref name="Keck press release">{{cite press release | title=Keck confirms transit planet | date=August 24, 2004 | publisher=W. M. Keck Observatory | location=Kamuela, Hawaii | url=http://www.keckobservatory.org/keck_confirms_transit_planet/ | accessdate=August 14, 2019 }}</ref>

}}

==External links==
{{commons category-inline|TrES-1 b|TrES-1}}
* [http://www.aavso.org/vstar/vsots/fall04.shtml AAVSO Variable Star Of The Season. Fall 2004: The Transiting Exoplanets HD 209458 and TrES-1] {{Webarchive|url=https://web.archive.org/web/20041028011426/http://www.aavso.org/vstar/vsots/fall04.shtml |date=2004-10-28 }}
* {{cite web | url=http://www.lowell.edu/media/releases.php?release=20040824 | title=Network of Small Telescopes Discovers Distant Planet | work=[[Lowell Observatory]] | accessdate=2008-10-15 | url-status=dead | archiveurl=https://web.archive.org/web/20080415095056/http://www.lowell.edu/media/releases.php?release=20040824 | archivedate=2008-04-15 }}
* {{cite web |url=http://media4.obspm.fr/exoplanetes/base/etoile.php?nom=TrES-1 |title=TrES-1 |accessdate=2008-06-21 |work=Catalogue d'exoplanètes |language=French}}
* {{cite web |url=http://www.iop.org/EJ/article/1538-3881/131/4/2274/205025.text.html |title=CHEMICAL COMPOSITION OF THE PLANET-HARBORING STAR TrES-1 |accessdate=2008-10-15 |work=The American Astronomical Society}}
* {{cite web |url=http://www.space.com/scienceastronomy/030522_exoplanet_direct.html |title=Glow of Alien Planets Detected in 'Milestone' Observations |accessdate=2008-06-21 |work=SPACE.com |date=2005-03-22 |first=Robert Roy |last=Britt}}
* {{cite web |url=http://www.cfa.harvard.edu/press/archive/pr0427.html |title=Tiny "David" Telescope Finds "Goliath" Planet |accessdate=2008-06-21 |work=Harvard-Smithsonian |publisher=Center for Astrophysics |date=2004-08-24}}

{{Sky|19|04|09|+|36|37|57|512}}

{{DEFAULTSORT:Tres-1}}
[[Category:Hot Jupiters]]
[[Category:Lyra]]
[[Category:Transiting exoplanets]]
[[Category:Exoplanets discovered in 2004]]
[[Category:Giant planets]]