HD 8673

{{Starbox begin

| name=HD 8673

}}

{{Starbox observe

| epoch = J2000

| constell = Andromeda

| ra = {{RA|01|26|08.78637}}

| dec = {{DEC|+34|34|46.9318}}

| appmag_v = 6.34

}}

{{Starbox character

| class = {{nowrap|F7 V + M2 V}}

| b-v = {{Val|0.500|0.004}}

| variable=

}}

{{Starbox astrometry

| radial_v = {{val|19.08|0.14}}

| prop_mo_ra = {{val|236.271|0.030}}

| prop_mo_dec = {{val|-84.632|0.022}}

| pm_footnote =

| parallax = 26.2036

| p_error = 0.0370

| parallax_footnote =

| absmag_v = 3.56

}}

{{Starbox orbit

| reference =

| axis_unitless = {{Val|35|–|60|ul=AU}}

| eccentricity = < 0.5

| inclination = 75–85

}}

{{Starbox detail

| source =

| component1 = HD 8673 A

| mass = {{Val|1.36|0.20}}

| radius = {{Val|1.521|0.049}}

| luminosity = {{Val|3.37|0.51|0.44}}

| temperature = 6,340

| rotational_velocity = 26.9

| gravity = 4.21

| metal_fe = 0.15

| age_gyr = {{Val|1.5|2.1|0.6}}

| component2 = HD 8673 B

| mass2 = 0.33–0.45

| temperature2 = 3,520-3,690

}}

{{Starbox catalog

| names={{odlist | BD=+33°228 | HD=8673 | HIP=6702 | HR=410 | SAO=54695 | WDS=J01262+3435AB | 2MASS=J01260875+3434471 | IRAS=01232+3418 | PPM=66283|Gaia DR2=317350357498173312}}

}}

{{Starbox reference

| Simbad = HD+8673

}}

HD 8673 is a binary star in the northern constellation of Andromeda. It has an apparent magnitude and absolute magnitude of 6.34 and 3.56 respectively. Based upon an annual parallax shift of {{Val|26.2|ul=mas}}, the system is located around 124.5 light years away. The system is moving further from the Earth with a heliocentric radial velocity of +19 km/s. A sub-stellar companion was detected in 2005; it could either be an exoplanet or a brown dwarf.

The primary component is an F-type main-sequence star with a stellar classification of F7 V. It has 1.36 times the mass of the Sun and 1.52 times the Sun's radius. The star is around 1.5 billion years old and is spinning with a projected rotational velocity of 26.9 km/s. It is radiating 3.4 times the Sun's luminosity from its photosphere at an effective temperature of 6,340 K.

Speckle interferometry measurements of this star between 2001 and 2008 showed a candidate stellar companion to this star, announced in 2011. It was unclear whether the pair formed a visual double or a binary system. The authors of the study estimated a class of K2 V, based upon a visual magnitude difference of {{Val|2.3|0.5}}. Subsequent observations using adaptive options did not spot this companion and it was concluded this was a false detection. However, a low mass stellar companion was detected in a wide orbit. This red dwarf star has 0.33–0.45 times the mass of the Sun and is orbiting with a semimajor axis of {{Val|35|–|60|ul=AU}}.

Planetary system

An orbiting sub-stellar companion with a minimum mass 14 times that of Jupiter in a high-eccentricity orbit was discovered in 2005 and confirmed in 2010. This object orbits at 3 AU away from the primary star with a period of 1,634 days and an eccentricity of 0.7. In 2022, the inclination and true mass of HD 8673 Ab were measured via astrometry.

{{OrbitboxPlanet begin

| name = HD 8673 A

| table_ref =

| period_unit = year

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|13.248|1.688|1.416}}

| semimajor = {{val|2.970|0.147|0.171}}

| period = {{val|4.503|0.030|0.043}}

| eccentricity = {{val|0.730|0.042|0.026}}

| inclination = {{val|95.450|19.444|8.816}}

}}

References

{{Reflist|refs=

{{cite journal

| title=A Sub-stellar Companion around the F7 V Star HD 8673

| last1=Hartmann | first1=Michael | last2=Guenther | first2=Eike W.

| last3=Hatzes | first3=Artie P. | display-authors=1

| journal=The Astrophysical Journal

| volume=717 | issue=1 | pages=348–356 | date=2010

| bibcode=2010ApJ...717..348H | doi=10.1088/0004-637X/717/1/348 | doi-access=free }}

{{cite journal

| title=Know the Star, Know the Planet. IV. A Stellar Companion to the Host Star of the Eccentric Exoplanet HD 8673b

| last1=Roberts | first1=Lewis C. | last2=Mason | first2=Brian D.

| last3=Neyman | first3=Christopher R. | last4=Wu | first4=Yanqin

| last5=Riddle | first5=Reed L. | last6=Shelton | first6=J. Christopher

| last7=Angione | first7=John | last8=Baranec | first8=Christoph

| last9=Bouchez | first9=Antonin | last10=Bui | first10=Khanh

| last11=Burruss | first11=Rick | last12=Burse | first12=Mahesh

| last13=Chordia | first13=Pravin | last14=Croner | first14=Ernest

| last15=Das | first15=Hillol | last16=Dekany | first16=Richard G.

| last17=Guiwits | first17=Stephen | last18=Hale | first18=David

| last19=Henning | first19=John | last20=Kulkarni | first20=Shrinivas

| last21=Law | first21=Nicholas | last22=McKenna | first22=Dan

| last23=Milburn | first23=Jennifer | last24=Palmer | first24=Dean

| last25=Punnadi | first25=Sujit | last26=Ramaprakash | first26=A. N.

| last27=Roberts | first27=Jennifer E. | last28=Tendulkar | first28=Shriharsh P.

| last29=Trinh | first29=Thang | last30=Troy | first30=Mitchell

| display-authors=1 | journal=The Astronomical Journal

| volume=149 | issue=4 | at=144 | year=2015

| arxiv=1502.06630 | bibcode=2015AJ....149..144R

| doi=10.1088/0004-6256/149/4/144 | s2cid=29694924 }}

{{cite journal

| title=Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs

| last1=Valenti | first1=J. A. | last2=Fischer | first2=D. A.

| journal=The Astrophysical Journal Supplement Series

| volume=159 | issue=1 | pages=141–166 | date=2005

| bibcode=2005ApJS..159..141V | doi=10.1086/430500 | doi-access=free }}

{{cite journal

| title= Know the star, know the planet. II. Speckle interferometry of exoplanet host stars

| last1=Mason | first1=Brian D. | last2=Hartkopf | first2=William I.

| last3=Raghavan | first3=Deepak | last4=Subasavage | first4=John P.

| last5=Roberts | first5=Lewis C. Jr. | last6=Turner | first6=Nils H.

| last7=ten Brummelaar | first7=Theo A. | display-authors=1

| journal=The Astronomical Journal

| doi=10.1088/0004-6256/142/5/176 | bibcode=2011AJ....142..176M | arxiv=1109.4569 | s2cid=16590094 }}

{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=The Astrophysical Journal Supplement Series |volume=262 |issue=21 |page=21 |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F|s2cid=251864022 |doi-access=free }}

}}

External links

{{cite encyclopedia |url=http://exoplanet.eu/planet.php?p1=HD+8673&p2=b |title=Notes for planet HD 8673 b |access-date=December 21, 2007 |archive-date=September 21, 2010 |archive-url=https://web.archive.org/web/20100921153324/http://exoplanet.eu/planet.php?p1=HD+8673&p2=b |encyclopedia=Extrasolar Planets Encyclopaedia |url-status=dead }}
{{cite journal |url=http://www.cosis.net/abstracts/EGU05/06592/EGU05-J-06592.pdf |author=Hatzes |display-authors=etal |title=The first extrasolar planets from the TOPS program: a superplanet around a massive evolved star and an F7 star. |journal=Geophysical Resource Abstract |date=2005 |volume=7 |access-date=December 21, 2007}}

Category:F-type main-sequence stars

Category:Andromeda (constellation)

Category:Durchmusterung objects

Category:Binary stars