HD 1502#Planetary system

{{Short description|K-type subgiant star in the constellation Pisces}}

{{Starbox image

| image=

{{Location mark

|image=Pisces IAU.svg|alt=|float=center|width=300

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=HD 1502

|x%=55|y%=46

}}

|caption=Location of HD 1502 (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Pisces

| ra = {{RA|00|19|17.0660}}

| dec = {{DEC|+14|03|17.123}}

| appmag_v = 8.36{{R|JohnsonClanton2011}}

}}

{{Starbox character

| type = subgiant

| class = K0 IV{{R|JohnsonClanton2011|LuhnBastien2019|BrewerFischer2016}}

| b-v = 0.92{{R|JohnsonClanton2011}}

| u-b =

}}

{{Starbox astrometry

| radial_v = {{val|−9.98|0.12}}

| prop_mo_ra = +74.4721547

| prop_mo_dec = −17.069

| parallax = 5.2018

| p_error = 0.0341

| parallax_footnote =

| absmag_v = +2.39

}}

{{Starbox detail

| source =

| mass = {{val|1.46|0.15}}{{R|BrewerFischer2016}}

| radius = {{val|4.67|0.57}}{{R|BrewerFischer2016}}

| luminosity = {{val|11.75|15.14|9.12}}{{R|BrewerFischer2016}}

| gravity = 3.18{{R|BrewerFischer2016}}

| metal_fe = {{val|0.09|0.03}}{{R|JohnsonClanton2011}}

| temperature = 4947{{R|BrewerFischer2016}}

| rotation =

| rotational_velocity = {{val|2.70|0.5}}{{R|JohnsonClanton2011}}

| age_gyr = {{val|3.0|1.2|0.8}}{{R|BrewerFischer2016}}

}}

{{Starbox catalog

| names = {{odlist | BD=+13°34 | GSC=00601-00636 | Gaia DR2=2768172019308167296 | TYC=601-636-1 | 2MASS=J00191704+1403172 | HD=1502 | HIP=1547 | SAO=91845 }}

}}

{{Starbox reference

| Simbad = HD+1502

}}

HD 1502 (proper name Citadelle) is an 8th-magnitude K-type subgiant star in the constellation of Pisces, located at a distance of approximately 630 light-years. A super-Jupiter planet, HD 1502 b (proper name Indépendance), is known to orbit the star.

Nomenclature

In 2019, the Republic of Haiti was assigned to giving the HD 1502 system a proper name as part of the IAU100 NameExoWorlds Project, planned to celebrate the hundredth anniversary of the International Astronomical Union (IAU), which grants the right to name an exoplanetary system to every state and territory in the world.{{R|NEWlist}} Names were submitted and selected within Haiti, which were then presented to the IAU to be officially recognized.{{R|Methodology}} On 17 December 2019, the IAU announced that HD 1502 and its planet, b, were named Citadelle and Indépendance, respectively.{{R|NEWHaiti}}

Citadelle refers to the Citadelle Laferrière, a fortress located in Milot in northern Haiti, which was built in 1820 and declared a World Heritage Site in 1982 as part of the National History Park. Indépendance was named after the Haitian Declaration of Independence, in celebration of the country's independence on 1 January 1804.{{R|NEWHaiti}}

Stellar characteristics

The star has evolved past the main sequence stage and is now a subgiant with a mass of 1.46 {{Solar mass|link=y}}, a radius of 4.67 {{Solar radius|link=y}}, and a spectral type of K0.{{R|JohnsonClanton2011|LuhnBastien2019|BrewerFischer2016}} The star is slightly richer than the Sun in elements heavier than hydrogen and helium, with a metallicity of {{val|0.09|0.03}}.{{efn|This translates to an abundance of iron 10^0.09≈1.23 times that of the Sun. The margin of error (0.06–0.12) corresponds to a comparative abundance of 115–132% (10^0.06–10^0.12).}}{{R|JohnsonClanton2011}}

The star has an effective temperature of {{convert|4947|K|C F}},{{R|BrewerFischer2016}} making it cooler than the Sun (5,772 K).{{Cite web |last=Williams |first=D. R. |date=1 July 2013 |title=Sun Fact Sheet |url=http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html |url-status=live |archive-url=https://web.archive.org/web/20100715200549/http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html |archive-date=15 July 2010 |access-date=12 August 2013 |publisher=NASA Goddard Space Flight Center}} Despite this, its large size makes it roughly 12 times brighter.{{R|BrewerFischer2016}} At around 3.0 billion years old,{{R|BrewerFischer2016}} the star is about two-thirds the age of the Sun (4.6 Gyr).{{Cite journal |last1=Connelly |first1=J. N. |last2=Bizzarro |first2=M. |last3=Krot |first3=A. N. |last4=Nordlund |first4=Å. |last5=Wielandt |first5=D. |last6=Ivanova |first6=M. A. |date=2 November 2012 |title=The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk |journal=Science |volume=338 |issue=6107 |pages=651–655 |bibcode=2012Sci...338..651C |doi=10.1126/science.1226919 |pmid=23118187 |s2cid=21965292}}{{Registration required}} Due to its high mass, however, it is further evolved than the Sun, which will spend a total of 10 billion years as a main sequence star.{{cite web|title=Main Sequence Stars|publisher=Australia Telescope National Facility |url=https://www.atnf.csiro.au/outreach/education/senior/astrophysics/stellarevolution_mainsequence.html|access-date=2024-07-17}}

Planetary system

In 2011, an exoplanet orbiting HD 1502, designated HD 1502 b, was discovered using the radial-velocity method.{{R|JohnsonClanton2011}} HD 1502 b revolves around its host star at a distance of {{convert|1.262|AU|km|abbr=on}} with a period of little over one year in a near-circular orbit (i.e., with a low eccentricity),{{R|LuhnBastien2019}} similarly to planets in the Solar System.{{cite journal | pmc = 4291657 | pmid=25512527 | doi=10.1073/pnas.1406545111 | volume=112 | issue=1 | title=Exoplanet orbital eccentricity: multiplicity relation and the Solar System | journal=Proc Natl Acad Sci U S A | pages=20–4 | last1 = Limbach | first1 = MA | last2 = Turner | first2 = EL|arxiv = 1404.2552 |bibcode = 2015PNAS..112...20L | year=2015 | doi-access=free }} It is a super-Jupiter planet with a minimum mass of 2.75 {{Jupiter mass|link=y}} and a predicted radius of 1.183 {{Jupiter radius|link=y}}.{{R|LuhnBastien2019}}

{{OrbitboxPlanet begin

| table_ref = {{R|LuhnBastien2019}}

}}

{{OrbitboxPlanet

| exoplanet = b (Indépendance)

| mass = {{val|p=≥|2.75|0.16}}

| semimajor = {{val|1.262|0.092}}

| period = {{val|428.5|1.2}}

| eccentricity = {{val|0.031|0.022}}

| inclination =

| radius = 1.183 (predicted)

}}

References

{{Reflist|refs=

{{cite journal|display-authors=1

|title=Retired A Stars and Their Companions. VII. 18 New Jovian Planets

|doi=10.1088/0067-0049/197/2/26|bibcode=2011ApJS..197...26J|arxiv=1108.4205}}

{{cite journal|display-authors=1

|title=Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts

|doi=10.3847/1538-3881/aaf5d0|doi-access=free|bibcode=2019AJ....157..149L|arxiv=1811.03043}}

{{cite journal|last1=Brewer|first1=John M.|last2=Fischer|first2=Debra A.|last3=Valenti|first3=Jeff A.|last4=Piskunov|first4=Nikolai|title=Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars

|doi=10.3847/0067-0049/225/2/32|doi-access=free|bibcode=2016ApJS..225...32B|arxiv=1606.07929}}

{{cite web

|url=http://www.nameexoworlds.iau.org/list-of-stars

|title=List of stars and planets {{!}} IAU100 Name ExoWorlds - An IAU100 Global Event

|website=Name Exoworlds|publisher=International Astronomical Union

|accessdate=2019-07-17}}

{{cite web

|url=http://www.nameexoworlds.iau.org/methodology

|title=Methodology {{!}} IAU100 Name ExoWorlds - An IAU100 Global Event

|website=Name Exoworlds|publisher=International Astronomical Union

|accessdate=2019-07-17}}

{{cite web

|title=Haiti {{!}} NameExoworlds

|url=http://www.nameexoworlds.iau.org/Haiti

|publisher=International Astronomical Union|website=Name Exoworlds|language=en

|accessdate=2020-01-26|date=2019-12-17}}

}}

HD 1502#Planetary system

Nomenclature

Stellar characteristics

Planetary system

See also

References

=Footnotes=

Further reading