Gliese 328#Planetary system

{{Starbox begin

|name=Gliese 328

}}

{{Starbox observe

| epoch = J2000

| constell = Hydra

| ra = {{RA|08|55|07.62173}}

| dec = {{DEC|+01|32|47.4151}}

| appmag_v = 9.997

}}

{{Starbox character

| type = main-sequence star

| class = M0V

| b-v = 1.30

}}

{{Starbox astrometry

| radial_v = {{val|-3.731|0.0015}}

| prop_mo_ra = 44.944

| prop_mo_dec = −1045.876

| pm_footnote =

| parallax = 48.7404

| p_error = 0.0184

| parallax_footnote =

}}

{{Starbox detail

| source =

| mass = {{val|0.65|0.08}}

| radius = {{val|0.63|0.07}}

| temperature = {{val|3897|71}}

| luminosity = 0.08

| gravity = {{val|4.64|0.07}}

| metal_fe = {{val|−0.06|0.09}}

| rotation = 33.6 days

| rotational_velocity =

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | BD=+02 2098 | GJ=328 | 2MASS = J08550761+0132472 | Ross=623 | TYC=213-177-1 | HIP=43790}}

}}

{{Starbox reference

| Simbad = Gliese+328

}}

Gliese 328, also known as BD+02 2098, is a red dwarf star located {{convert|66.9|ly|pc|lk=on|abbr=off}} away in the constellation Hydra. Its surface temperature is 3989 K. Gliese 328 is depleted in heavy elements compared to the Sun, with a metallicity Fe/H index of −0.13. The age of the star is unknown. Gliese 328 exhibits an activity cycle similar to that of the Sun, with a period around 2000 d.

Multiplicity surveys did not detect any stellar companions as of 2016.{{citation|arxiv=1601.01524|title=A lucky imaging multiplicity study of exoplanet host stars II|year=2016|doi=10.1093/mnras/stw049|last1=Ginski|first1=C.|last2=Mugrauer|first2=M.|last3=Seeliger|first3=M.|last4=Buder|first4=S.|last5=Errmann|first5=R.|last6=Avenhaus|first6=H.|last7=Mouillet|first7=D.|last8=Maire|first8=A.-L.|last9=Raetz|first9=S.|journal=Monthly Notices of the Royal Astronomical Society|volume=457|issue=2|pages=2173–2191|doi-access=free |bibcode=2016MNRAS.457.2173G|s2cid=53626523}}

Planetary system

In 2013, one superjovian planet, named Gliese 328 b, was discovered on a wide, eccentric orbit by the radial velocity method. The known planetary orbit is wide enough to not disrupt orbits of other bodies in the habitable zone of the star. In 2023, a second, Neptune-mass planet was discovered orbiting closer to the star.

{{OrbitboxPlanet begin

| name = Gliese 328

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = c

| mass_earth = {{val|21.4|3.4|3.2|p=≥}}

| radius_earth =

| semimajor = {{val|0.657|0.026|0.028}}

| period = {{val|241.8|1.3|1.7}}

| eccentricity =

| inclination =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|2.51|0.23|p=≥}}

| radius =

| semimajor = {{val|4.11|0.16|0.18}}

| period = {{val|3771|17}}

| eccentricity = {{val|0.227|0.015}}

| inclination =

}}

References

{{Reflist|refs=

{{citation|arxiv=1307.7640|year=2013|title=Secretly Eccentric: The Giant Planet and Activity Cycle of GJ 328|doi=10.1088/0004-637X/774/2/147|last1=Robertson|first1=Paul|last2=Endl|first2=Michael|last3=Cochran|first3=William D.|last4=MacQueen|first4=Phillip J.|last5=Boss|first5=Alan P.|journal=The Astrophysical Journal|volume=774|issue=2|page=147|bibcode=2013ApJ...774..147R|s2cid=118514735}}

{{citation|arxiv=1804.02925|year=2019|title=Cycle period, differential rotation and meridional flow for early M dwarf stars|doi=10.1051/0004-6361/201833173|last1=Küker|first1=M.|last2=Rüdiger|first2=G.|last3=Olah|first3=K.|last4=Strassmeier|first4=K. G.|journal=Astronomy & Astrophysics|volume=622|pages=A40|bibcode=2019A&A...622A..40K|s2cid=118842388}}

{{citation|arxiv=1910.07573|year=2020|title=Resilient habitability of nearby exoplanet systems|doi=10.1093/mnras/stz3408|last1=Kokaia|first1=Giorgi|last2=Davies|first2=Melvyn B.|last3=Mustill|first3=Alexander J.|journal=Monthly Notices of the Royal Astronomical Society|volume=492|issue=1|pages=352–368|doi-access=free |bibcode=2020MNRAS.492..352K|s2cid=204743669}}

{{citation|arxiv=2003.11447|title=The M dwarf problem: Fe and Ti abundances in a volume-limited sample of M dwarf stars|year=2020|doi=10.1093/mnras/staa878|last1=Wallerstein|first1=George|last2=Woolf|first2=Vincent M.|journal=Monthly Notices of the Royal Astronomical Society|volume=494|issue=2|pages=2718–2726|doi-access=free |bibcode=2020MNRAS.494.2718W|s2cid=214641078}}

{{cite journal |last1=Pinamonti |first1=M. |last2=Barbato |first2=D. |display-authors=etal |date=June 2023 |title=The GAPS programme at TNG. XLVI. Deep search for low-mass planets in late-dwarf systems hosting cold Jupiters |journal=Astronomy & Astrophysics |volume= 677|issue= |pages= |doi= 10.1051/0004-6361/202346476|arxiv=2306.04419|bibcode=2023A&A...677A.122P }}

}}

Category:Hydra (constellation)

Category:M-type main-sequence stars

Category:Planetary systems with two confirmed planets