View source for Astronomy:HD 37605

{{Short description|Star in the constellation Orion}}
{{Starbox begin}}
{{Starbox observe
 | epoch       = J2000.0
 | constell    = [[Astronomy:Orion (constellation)|Orion]]
 | ra          = {{RA|05|40|01.7281}}<ref name="Gaia DR2"/>
 | dec         = {{DEC|+06|03|38.0743}}<ref name="Gaia DR2"/>
 | appmag_v    = 8.67<ref name=Anderson2012/>
}}
{{Starbox character 
 | type        =  
 | class       = K0&nbsp;V<ref name=wang/>
 | b-v         = {{Val|0.827|0.005}}<ref name=Anderson2012/>
 | variable    = 
}}
{{Starbox astrometry
 | radial_v    = {{Val|−21.81|0.25}}<ref name="Gaia DR2"/>
 | prop_mo_ra  = {{val|52.466|0.089}}<ref name="Gaia DR2"/>
 | prop_mo_dec = {{val|−247.255|0.076}}<ref name="Gaia DR2"/>
 | parallax    = 21.3450
 | p_error     = 0.0517
 | parallax_footnote = <ref name="Gaia DR2"/>
 | absmag_v    = 5.46<ref name=Anderson2012/>
}}
{{Starbox detail
 | source      = <ref name="Bonfanti2015"/>
 | mass        = {{Val|0.98|0.01}}
 | radius      = {{Val|0.89|0.01}}
 | luminosity  = {{Val|0.602|0.002}}
 | gravity     = {{Val|4.52|0.01}}
 | temperature = {{Val|5380|13|fmt=commas}}
 | metal_fe    = {{Val|0.25|0.04}}<ref name=aguilera-gomez2018/>
 | rotational_velocity = 4.5<ref name=Earle2017/>
 | rotation    = 57.67<ref name=wang/>&nbsp;days
 | age_gyr     = {{Val|1.8|1.0}} or 7<ref name=wang/>
}}
{{Starbox catalog 
 | names = {{odlist | BD=+05°985 | FK5= | HD=37605 | HIP=26664 | HR= | SAO=113015 | LTT=11695 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = HD+37605
 | EPE = HD+37605 
 | NSTED = HD+37605
}}
{{Starbox end}}

'''HD 37605''' is a [[Astronomy:Star|star]] in the [[Celestial equator|equatorial]] [[Astronomy:Constellation|constellation]] of [[Astronomy:Orion (constellation)|Orion]]. It is orange in hue but is too faint to be visible to the naked eye, having an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of 8.67.<ref name=Anderson2012/> [[Astronomy:Stellar parallax|Parallax]] measurements yield a distance estimate of 153&nbsp;[[Light year|light year]]s from the [[Astronomy:Sun|Sun]]. It has a high [[Astronomy:Proper motion|proper motion]]<ref name=wang/> and is drifting closer with a [[Astronomy:Radial velocity|radial velocity]] of −22&nbsp;km/s.<ref name="Gaia DR2"/>

This object is a [[Astronomy:K-type main-sequence star|K-type main-sequence star]] with a [[Astronomy:Stellar classification|stellar classification]] of K0&nbsp;V.<ref name=wang/> It is an [[Astronomy:Magnetic activity|inactive]], [[Astronomy:Metallicity|metal-rich]] star. Age estimates range from 1.8<ref name="Bonfanti2015"/> up to 7<ref name=wang/>&nbsp;billion years old, and it is spinning with a projected rotational velocity of 4.5&nbsp;km/s.<ref name=Earle2017/> The star has 98% of the mass of the Sun and 89% of the Sun's radius. It is radiating 60% of the luminosity of the Sun from its [[Astronomy:Photosphere|photosphere]] at an [[Astronomy:Effective temperature|effective temperature]] of 5,380&nbsp;K.<ref name="Bonfanti2015"/>

==Planets==
There are two [[Astronomy:Giant planet|giant planet]]s known in orbit. Planet b was discovered in 2004<ref name="Cochran2004"/> and planet c was discovered eight years later. The planets do not transit relative to Earth; b's maximum inclination is 88.1%.<ref name=wang/><ref name="TERMS"/>

In a simulation, HD 37605 b's orbit "sweeps clean" most test particles within 0.5 AU; leaving only asteroids "in low-eccentricity orbits near the known planet’s apastron distance, near the 1:2 mean-motion resonance" with oscillating eccentricity up to 0.06, and also at 1:3 with oscillating eccentricity up to 0.4. Also, observation has ruled out planets heavier than 0.7 Jupiter mass with a period of one year or less; which still allows for planets at 0.8 AU or more.<ref name=Wittenmyer2007/>

{{OrbitboxPlanet begin
 | table_ref = <ref name="Ment2018"/>
}}
{{OrbitboxPlanet
 | exoplanet = [[Astronomy:HD 37605 b|b]]
 | mass = {{val|2.69|0.3|p=≥}}
 | semimajor = {{val|0.277|0.015}}
 | period = {{val|55.01292|0.00062}}
 | eccentricity = {{val|0.6745|0.0019}}
}}
{{OrbitboxPlanet
 | exoplanet = c
 | mass = {{val|3.19|0.38|p=≥}}
 | semimajor = {{val|3.74|0.21}}
 | period = {{val|2720|15}}
 | eccentricity = {{val|0.03|0.012}}
}}
{{Orbitbox end}}

==References==
{{Reflist|refs=

<ref name=SIMBAD>{{Cite simbad | title=HD 37605 | access-date=2019-12-31 }}</ref>

<ref name=Earle2017>{{cite journal
 | title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants
 | last1=Luck | first1=R. Earle
 | journal=The Astronomical Journal
 | volume=153 | issue=1 | id=21 | pages=19 | date=January 2017
 | bibcode=2017AJ....153...21L | arxiv=1611.02897
 | doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | doi-access=free }}</ref>

<ref name=aguilera-gomez2018>{{cite journal
 | display-authors=1 | last1=Aguilera-Gómez | first1=Claudia
 | last2=Ramírez | first2=Iván | last3=Chanamé | first3=Julio
 | title=Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert
 | journal=Astronomy and Astrophysics
 | volume=614 | pages=A55 | year=2018
 | arxiv=1803.05922 |doi=10.1051/0004-6361/201732209
 | bibcode=2018A&A...614A..55A | s2cid=62799777 }}</ref>

<ref name=Anderson2012>{{Cite journal
 | title=XHIP: An extended hipparcos compilation
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | journal=Astronomy Letters
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | arxiv=1108.4971
 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name=wang>{{Cite journal
 | title=The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b
 | last1=Wang Xuesong | first1=Sharon | last2=Wright | first2=Jason T.
 | last3=Cochran | first3=William | last4=Kane | first4=Stephen R.
 | last5=Henry | first5=Gregory W. | last6=Payne | first6=Matthew J.
 | last7=Endl | first7=Michael | last8=MacQueen | first8=Phillip J.
 | last9=Valenti | first9=Jeff A. | last10=Antoci | first10=Victoria
 | last11=Dragomir | first11=Diana | last12=Matthews | first12=Jaymie M.
 | last13=Howard | first13=Andrew W. | last14=Marcy | first14=Geoffrey W.
 | last15=Isaacson | first15=Howard | last16=Ford | first16=Eric B.
 | last17=Mahadevan | first17=Suvrath | last18=von Braun | first18=Kaspar
 | display-authors=1 | journal=Astrophysical Journal
 | year=2012 | volume=761 | issue=1 | pages=46
 | arxiv=1210.6985 | bibcode=2012ApJ...761...46W
 | doi=10.1088/0004-637X/761/1/46 | s2cid=118679173 }}</ref>

<ref name="TERMS">{{cite journal
 | url=http://www.abstractsonline.com/Plan/ViewAbstract.aspx?sKey=ca3fe43b-0d3d-4ef8-8872-5c048b7dd028&cKey=f76c07ea-7315-4f15-969d-8aa3cbadecbf&mKey=%7b25369F54-5CB0-4639-BC20-B20273090B9A%7d#
 | first=S. | last=Kane
 | title=The TERMS Project: More Than Just Transit Exclusion
 | journal=OASIS
 | date=2012 | volume=44 | number=228.07
 | bibcode=2012AAS...21922807K }}</ref>

<ref name=Wittenmyer2007>{{cite journal
 | url=http://www.iop.org/EJ/article/1538-3881/134/3/1276/205882.html
 | last1=Wittenmyer | first1=Robert A. | last2=Endl | first2=Michael
 | last3=Cochran | first3=William D. | last4=Leviso | first4=Harold F.
 | title=Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems
 | display-authors=1 | journal=[[Astronomy:The Astronomical Journal|The Astronomical Journal]]
 | volume=134 | issue=3 | pages=1276–1284 | date=2007
 | doi=10.1086/520880 | arxiv=0706.1962
 | bibcode=2007AJ....134.1276W | s2cid=14345035 }}</ref>

<ref name="Bonfanti2015">{{cite journal
 | title=Revising the ages of planet-hosting stars
 | url=http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html
 | last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.
 | last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.
 | display-authors=1 | journal=Astronomy and Astrophysics
 | year=2015 | volume=575 | at=A18 | arxiv=1411.4302
 | bibcode=2015A&A...575A..18B | doi=10.1051/0004-6361/201424951 | s2cid=54555839
 }}</ref>

<ref name="Cochran2004">{{cite journal
 | title=The First Hobby-Eberly Telescope Planet: A Companion to HD 37605
 | last1=Cochran | first1=Michael | last2=Endl | first2=Michael
 | last3=McArthur | first3=Barbara | last4=Paulson | first4=Diane B.
 | last5=Smith | first5=Verne V. | last6=MacQueen | first6=Phillip J.
 | last7=Tull | first7=Robert G. | last8=Good | first8=John
 | last9=Booth | first9=John | last10=Shetrone | first10=Matthew
 | last11=Roman | first11=Brian | last12=Odewahn | first12=Stephen
 | last13=Deglman | first13=Frank | last14=Graver | first14=Michelle
 | last15=Soukup | first15=Michael | last16=Villarreal, Jr. | first16=Martin L.
 | display-authors=1 | journal=The Astrophysical Journal Letters
 | volume=611 | issue=2 | pages=L133–L136 | year=2004
 | arxiv=astro-ph/0407146 | bibcode=2004ApJ...611L.133C
 | doi=10.1086/423936 | s2cid=85460384 }}</ref>

<ref name="Gaia DR2">{{Cite Gaia DR2|3332911492327546368}}</ref>

<ref name="Ment2018">{{cite journal
 | title=Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810
 | last1=Ment | first1=Kristo | last2=Fischer | first2=Debra A.
 | last3=Bakos | first3=Gaspar | last4=Howard | first4=Andrew W.
 | last5=Isaacson | first5=Howard | display-authors=1
 | journal=The Astronomical Journal
 | volume=156 | issue=5 | at=213 | year=2018
 | arxiv=1809.01228 | bibcode=2018AJ....156..213M
 | doi=10.3847/1538-3881/aae1f5 | s2cid=119243619 | doi-access=free }}</ref>

}}

==External links==

{{Sky|05|40|01.7296|+|06|03|38.085|139.9}}

{{Stars of Orion}}

{{DEFAULTSORT:HD 37605}}
[[Category:K-type main-sequence stars]]
[[Category:Orion (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|037605]]
[[Category:Hipparcos objects|026664]]

{{Sourceattribution|HD 37605}}