View source for Astronomy:BD+48 740

{{Short description|Giant star in the constellation Perseus}}
{{Starbox begin
| name=BD+48 740
}}
{{Starbox observe
| epoch=J2000
| ra={{RA|02|42|58.21780}}<ref name=HIP>{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F. |journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid = 18759600}}</ref>
| dec={{DEC|+48|55|48.2155}}<ref name=HIP/>
| constell=[[Astronomy:Perseus (constellation)|Perseus]] 
}}
{{Starbox character
| class= K3III<ref name=SIMBAD>{{cite simbad|title=BD+48 740|access-date=7 June 2017}}</ref>
}}
{{Starbox astrometry
| radial_v=-5.60 ± 0.51<ref>{{cite journal|bibcode=2005A&A...430..165F |title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters |journal=Astronomy and Astrophysics |volume=430 |pages=165 |last1=Famaey |first1=B. |last2=Jorissen |first2=A. |last3=Luri |first3=X. |last4=Mayor |first4=M. |last5=Udry |first5=S. |last6=Dejonghe |first6=H. |last7=Turon |first7=C. |year=2005 |doi=10.1051/0004-6361:20041272 |arxiv = astro-ph/0409579 |s2cid=17804304 }}</ref>
| prop_mo_ra=-5.94<ref name=HIP/>
| prop_mo_dec=-2.02<ref name=HIP/>
| parallax=1.36
| p_error=1.13
| parallax_footnote=<ref name=HIP/>
}}
{{Starbox detail
| source                 =   <ref name=Adamow2018/>
| mass                   =   1.09{{±|0.16}}
| radius                 =   10.33{{±|1.81}}
| luminosity             =   43.7
| gravity                =   2.48{{±|0.04}}
| temperature            =   4534{{±|8}}
| metal                  =   <!--Metallicity (no units provided by template)-->
| metal_fe               =   -0.13{{±|0.06}}
| rotation               =   <!--Rotation (no units provided by template)-->
| rotational_velocity    =   <2.9
| age                    =   <!--Age (in years)-->
| age_myr                =   <!--Age (in millions of years)-->
| age_gyr                =   <!--Age (in billions of years)-->
}}
{{Starbox catalog
| names=[[Astronomy:Durchmusterung|BD]]+48 740, [[Astronomy:Astronomische Gesellschaft Katalog|AG]]+48 308, [[Astronomy:Guide Star Catalog|GSC]] 03304-00090, HIC 12684, HIP 12684, [[Astronomy:2MASS|2MASS]] J02425822+4855483, [[Astronomy:PPM Star Catalogue|PPM]] 45405, [[Astronomy:Smithsonian Astrophysical Observatory Star Catalog|SAO]] 38272, TYC 3304-90-1<ref name=SIMBAD/>
}}
{{Starbox reference 
|  Simbad=BD%2B48+740}}
{{Starbox end}}

'''BD+48 740''' is a [[Astronomy:Giant star|giant star]] suspected of having recently engulfed one of its planets. The star's atmosphere has an overabundance of [[Chemistry:Lithium|lithium]], a metal that is destroyed by nuclear reactions in stars. 
==Planetary system==
Detection of variations in the star's [[Astronomy:Radial velocity|radial velocity]] led to the discovery of the superjovian planet BD+48 740 b in 2012,<ref name=Adamow2012/> with the discovery having been confirmed in 2018.<ref name=Adamow2018>{{citation|arxiv=1801.04379|year=2018|title=Tracking Advanced Planetary Systems (TAPAS) with HARPS-N|doi=10.1051/0004-6361/201732161|last1=Adamów|first1=M.|last2=Niedzielski|first2=A.|last3=Kowalik|first3=K.|last4=Villaver|first4=E.|last5=Wolszczan|first5=A.|last6=MacIejewski|first6=G.|last7=Gromadzki|first7=M.|journal=Astronomy & Astrophysics|volume=613|pages=A47|s2cid=56091464}}</ref> The planet BD+48 740 b has a minimal mass of 1.7{{Jupiter_mass}} and is in a highly eccentric orbit (its distance from the star ranges from 0.3 to 3 astronomical units), which would destabilize the orbits of any other planets. These indications led the discoverers to the conclusion that another planet has recently plunged into the star, been destroyed, and contributed its lithium content to the star.<ref name=Adamow2012>{{cite journal |bibcode=2012ApJ...754L..15A |title=BD+48 740—Li Overabundant Giant Star with a Planet: A Case of Recent Engulfment? |last1=Adamów |first1=M. |last2=Niedzielski |first2=A. |last3=Villaver |first3=E. |last4=Nowak |first4=G. |last5=Wolszczan |first5=A. |journal=The Astrophysical Journal |year=2012 |volume=754 |issue=1 |pages=L15 |doi=10.1088/2041-8205/754/1/L15 |arxiv=1206.4938 |s2cid=53550985 }}</ref>

{{Orbitbox planet begin|name=BD+48 740|semimajor_ref=|period_unit=day
|table_ref=<ref name=Adamow2018/>
}}
{{Orbitbox planet
|exoplanet=[[Astronomy:BD+48 740 b|b]]
| mass = >1.7{{±|0.7}}
| radius = <!-- Radius of the planet, in Jupiter radii -->
| semimajor = 1.7{{±|0.1}}
| period = 733{{±|5|8}}
| eccentricity = 0.76{{±|0.05|0.09}}
| inclination = <!-- Orbital inclination (to the line of sight) -->
}}{{Orbitbox end}}

==References==
{{reflist}}

==External links==
* {{cite journal |arxiv=1206.4938 |doi=10.1088/2041-8205/754/1/L15 |title=BD+48 740—Li OVERABUNDANT GIANT STAR WITH a PLANET: A CASE OF RECENT ENGULFMENT? |year=2012 |last1=Adamów |first1=M. |last2=Niedzielski |first2=A. |last3=Villaver |first3=E. |last4=Nowak |first4=G. |last5=Wolszczan |first5=A. |journal=The Astrophysical Journal |volume=754 |issue=1 |pages=L15 |bibcode=2012ApJ...754L..15A |s2cid=53550985 }}

{{2012 in space}}
{{Stars of Perseus}}

{{DEFAULTSORT:BD+48 740}}
[[Category:Perseus (constellation)]]
[[Category:K-type giants]]
[[Category:Durchmusterung objects|BD+48 0740]]
[[Category:Hipparcos objects|012684]]
[[Category:2MASS objects|J02425822+4855483]]
[[Category:Planetary systems with one confirmed planet]]

{{giant-star-stub}}{{Extrasolar-planet-stub}}
{{Sourceattribution|BD+48 740}}