DH Tauri
{{Short description|Star in the constellation Taurus}}
{{Starbox begin}}
{{Starbox image
| image= 250px
| caption=DH Tauri and the b companion (lower left) with the Very Large Telescope
| credit=ESO VLT SPHERE; Van Holstein et al.; Processing: Meli_thev
}}
{{Starbox observe
| constell = Taurus
| epoch = J2000.0
}}
{{Starbox character
| type =
| variable = T Tau
}}
{{Starbox astrometry
| radial_v =
| parallax = 7.3880
| p_error = .0593
| absmag_v =
}}
{{Starbox detail
}}
{{Starbox catalogue
| names = {{odlist |V=DH Tau |2MASS=J04294155+2632582 |IRAS=04267+2626 |WDS=J04297+2633B }}
}}
{{Starbox reference
| Simbad = DH+Tauri
}}
{{Starbox end}}
DH Tauri, also known as DH Tau, is a type M star, located 140 parsecs (456.619 light years) away. It forms a binary system with DI Tauri {{val|15|ul="}} away, and has a substellar companion, either a brown dwarf or massive exoplanet.
Characteristics
DH Tauri is a type M, or red dwarf star, one of the most common types of star in the Milky Way. It has an apparent magnitude of 13.71 and temperature of {{val|3751|fmt=commas|ul=K}}. DH Tauri has a mass of {{solar mass|0.41}} and an estimated radius of {{solar radius|1.26}}, which is unusually large for a red dwarf.
The companion DH Tauri B or b has a mass estimated to be between {{jupiter mass|eight}} and {{jupiter mass|50}}, making it either a super-Jupiter or brown dwarf.{{Cite journal |last1=Itoh |first1=Yoichi |last2=Hayashi |first2=Masahiko |last3=Tamura |first3=Motohide |last4=Tsuji |first4=Takashi |last5=Oasa |first5=Yumiko |last6=Fukagawa |first6=Misato |last7=Hayashi |first7=Saeko S. |last8=Naoi |first8=Takahiro |last9=Ishii |first9=Miki |last10=Mayama |first10=Satoshi |last11=Morino |first11=Jun-ichi |last12=Yamashita |first12=Takuya |last13=Pyo |first13=Tae-Soo |last14=Nishikawa |first14=Takayuki |last15=Usuda |first15=Tomonori |date=2005-02-20 |title=A Young Brown Dwarf Companion to DH Tauri |url=https://iopscience.iop.org/article/10.1086/427086 |journal=The Astrophysical Journal |language=en |volume=620 |issue=2 |pages=984–993 |arxiv=astro-ph/0411177 |bibcode=2005ApJ...620..984I |doi=10.1086/427086 |issn=0004-637X}} Other sources give a mass as high as {{solar mass|0.03}}, with a bolometric luminosity of {{solar luminosity|0.01}}. The spectral type has been classified as M7.5 or M9.25. The companion has detected water vapor and carbon monoxide in its atmosphere and has a rotational velocity of 9.6 ± 0.7 km/s. This is between 9 and 15% of the breakup speed of DH Tau B. This low rotation is in agreement with magnetic coupling to a circumplanetary disk in the late stages of accretion, which reduces angular momentum of the companion. The companion, while its host star still having a protoplanetary disk, is still accreting material, being surrounded by a circumsubstellar disk (possibly a circumplanetary disk, depending on its formation history). It is potentially orbited by a smaller candidate companion DH Tauri Bb (possibly an exomoon) with {{jupiter mass|1}}, and a mass ratio with respect to the brown dwarf of one-tenth.{{cite journal |last=Lazzoni |first=C. |display-authors=etal |date=20 July 2020 |title=The search for disks or planetary objects around directly imaged companions: A candidate around DH Tau B |journal=Astronomy & Astrophysics |volume=641 |pages=A131 |doi=10.1051/0004-6361/201937290 |arxiv=2007.10097|bibcode=2020A&A...641A.131L |s2cid=220647289 }}
{{OrbitboxPlanet begin
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = {{val|11|3|}}
| period = {{val|120.450|}}
| semimajor = {{val|330|}}
| age =
| discovery year = {{val|2004}}
| radius = {{val|2.7|0.8|}}
}}
{{Orbitbox end}}
References
{{Reflist|refs=
{{cite DR2|151374202498079872}}
}}
{{Stars of Taurus}}
{{DEFAULTSORT:DH Tauri}}
Category:M-type main-sequence stars
Category:IRAS catalogue objects