HD 7449#Planetary system

{{Short description|Binary star system in the constellation Cetus}}

{{Starbox begin

| name = HD 7449

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|01|14|29.32229}}

| dec = {{DEC|-05|02|50.6148}}

| constell = Cetus

| appmag_v = 7.50

}}

{{Starbox character

| class = {{nowrap|F9.5V + M4.5}}

| b-v = 0.575{{±|0.007}}

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|-19.60|0.13}}

| prop_mo_ra = {{val|-164.544|0.039}}

| prop_mo_dec = {{val|-134.382|0.028}}

| pm_footnote =

| parallax = 25.9132

| p_error = 0.0287

| parallax_footnote =

| absmag_v = 4.55

}}

{{Starbox orbit

| reference =

| primary = HD 7449 A

| name = HD 7449 B

| period = {{val|175.310|43.633|34.380}}

| axis =

| axis_unitless = {{val|34.655|5.498|4.781|ul=AU}}

| eccentricity = {{val|0.301|0.084|0.102}}

| inclination = {{val|68.400|4.103|3.887}}

| node = {{val|325.935|2.865|2.404}}

| periastron = {{val|2391480.709|12803.765|15269.796}}

| periarg = {{val|201.186|12.830|13.166}}

| k1 = {{val|0.720525|0.043724|0.029891}}

}}

{{Starbox detail

| source ={{citation|arxiv=1511.01744|title=Age consistency between exoplanet hosts and field stars|year=2016|doi=10.1051/0004-6361/201527297|last1=Bonfanti|first1=A.|last2=Ortolani|first2=S.|last3=Nascimbeni|first3=V.|journal=Astronomy & Astrophysics|volume=585|pages=A5|bibcode=2016A&A...585A...5B|s2cid=53971692}}

| component1=HD 7449 A

| component2=HD 7449 B

| mass = 1.05{{±|0.02}}

| mass2 = {{val|0.23|0.22|0.05}}

| mass_mj2 = {{val|178.151|16.614|13.664}}

| radius = 1.02{{±|0.02}}

| gravity = 4.44{{±|0.02}}

| luminosity = 1.26{{±|0.02}}

| temperature = 6060{{±|42}}

| temperature2=3000

| metal = −0.11{{±|0.01}}

| rotation =

| rotational_velocity =

| age_gyr = 2.2{{±|1.3}}

}}

{{Starbox catalog

| names = {{odlist|HD=7449|BD=-05 215|2MASS=J01142933-0502504|HIP=5806|TYC=4683-883-1}}

}}

{{Starbox reference

| Simbad = HD+7449

}}

HD 7449 is a binary star system about {{val|126|fmt=commas|u=light-years}} way. The primary star, HD 7449 A, is a main-sequence star belonging to the spectral class F9.5. It is younger than the Sun. The primary star is slightly depleted of heavy elements, having 80% of solar abundance.

Companion

The stellar companion HD 7449 B, belonging to spectral class M4.5, was discovered in 2015.[http://www.openexoplanetcatalogue.com/planet/HD%207449%20b/ Open Exoplanet Catalogue an open source database of all discovered extrasolar planets HD 7449] A survey in 2017 has failed to find additional stars with masses above 0.35{{Solar mass}} in the system.{{citation|arxiv=1709.05315|year=2017|doi=10.3847/1538-3881/aa8d69|last1=Wittrock|first1=Justin M.|last2=Kane|first2=Stephen R.|last3=Horch|first3=Elliott P.|last4=Howell|first4=Steve B.|last5=Ciardi|first5=David R.|last6=Everett|first6=Mark E.|title=Exclusion of Stellar Companions to Exoplanet Host Stars|journal=The Astronomical Journal|volume=154|issue=5|page=184|bibcode=2017AJ....154..184W|s2cid=55789971 |doi-access=free }}

The most recent parameters for HD 7449 B as of 2022 come from a combination of data from radial velocity, astrometry, and imaging, showing that it is about {{Jupiter mass|178|link=y}} ({{Solar mass|0.17|link=y}}), and orbiting with a semi-major axis of about 34.7 AU and an orbital period of about 175 years.

Planetary system

In 2011 one super-Jupiter-mass planet, {{ill|HD 7449 Ab|fr|HD 7449 b}} on a very eccentric orbit around HD 7449 A was discovered utilising the radial velocity method. A second, long-term radial velocity trend is present, and a second planet or brown dwarf has been proposed as the cause of this trend. However, in 2015 a low-mass stellar companion (HD 7449 B) was found, which is likely the cause of the long-term trend. The large eccentricity of the inner planet is likely caused by this stellar companion. In 2022, the inclination and true mass of HD 7449 Ab were measured via astrometry.

{{OrbitboxPlanet begin

| name = HD 7449 A

| table_ref =

| period_unit = year

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|8.174|3.055|2.699}}

| radius =

| semimajor = {{val|2.438|0.062|0.063}}

| period = {{val|3.479|0.029|0.020}}

| eccentricity = {{val|0.752|0.035|0.032}}

| inclination = {{val|171.631|2.609|3.740}}

}}

References

{{reflist|refs=

{{citation|arxiv=1107.1748|title=The HARPS search for southern extra-solar planets. XXX. Planetary systems around stars with solar-like magnetic cycles and short-term activity variation|year=2011|doi=10.1051/0004-6361/201117148|last1=Dumusque|first1=X.|last2=Lovis|first2=C.|last3=Ségransan|first3=D.|last4=Mayor|first4=M.|last5=Udry|first5=S.|last6=Benz|first6=W.|last7=Bouchy|first7=F.|last8=Lo Curto|first8=G.|last9=Mordasini|first9=C.|last10=Pepe|first10=F.|last11=Queloz|first11=D.|last12=Santos|first12=N. C.|last13=Naef|first13=D.|journal=Astronomy & Astrophysics|volume=535|pages=A55|bibcode=2011A&A...535A..55D|s2cid=119192207}}

{{cite journal |bibcode=2016ApJ...818..106R |title=MagAO Imaging of Long-period Objects (MILO). I. A Benchmark M Dwarf Companion Exciting a Massive Planet around the Sun-like Star HD 7449 |last1=Rodigas |first1=Timothy J. |last2=Arriagada |first2=Pamela |last3=Faherty |first3=Jackie |last4=Anglada-Escudé |first4=Guillem |last5=Kaib |first5=Nathan |last6=Butler |first6=R. Paul |last7=Shectman |first7=Stephen |last8=Weinberger |first8=Alycia |last9=Males |first9=Jared R. |last10=Morzinski |first10=Katie M. |last11=Close |first11=Laird M. |last12=Hinz |first12=Philip M. |last13=Crane |first13=Jeffrey D. |last14=Thompson |first14=Ian |last15=Teske |first15=Johanna |last16=Díaz |first16=Matías |last17=Minniti |first17=Dante |last18=Lopez-Morales |first18=Mercedes |last19=Adams |first19=Fred C. |last20=Boss |first20=Alan P. |journal=The Astrophysical Journal |year=2016 |volume=818 |issue=2 |page=106 |doi=10.3847/0004-637X/818/2/106 |arxiv=1512.04540 |s2cid=51813840 |doi-access=free }}

{{citation|arxiv=1901.08471|title=Truly eccentric. I. Revisiting eight single-eccentric planetary systems|year=2019|doi=10.1093/mnras/stz290|last1=Wittenmyer|first1=Robert A.|last2=Clark|first2=Jake T.|last3=Zhao|first3=Jinglin|last4=Horner|first4=Jonathan|last5=Wang|first5=Songhu|last6=Johns|first6=Daniel|journal=Monthly Notices of the Royal Astronomical Society|volume=484|issue=4|pages=5859–5867|doi-access=free |bibcode=2019MNRAS.484.5859W|s2cid=118915974}}

{{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 }}

{{cite journal

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

}}

Category:F-type main-sequence stars

Category:M-type main-sequence stars

Category:Binary stars

Category:Planetary systems with one confirmed planet

Category:Multi-star planetary systems

Category:Cetus

Category:Durchmusterung objects

007449

005806

J01142933-0502504