WASP-34

WASP-34, also named Amansinaya,^[6] is a sunlike star of spectral type G5V that has 1.01 times the mass and 0.93 times the diameter of the Sun. It rotates on its axis every 34±15 days, indicating it is around 6.7 billion years old. It hosts at least one exoplanet.^[3]

WASP-34

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Crater
Right ascension	11h 01m 35.8978s[1]
Declination	–23° 51′ 38.387″[1]
Apparent magnitude (V)	+10.28[2]
Characteristics
Spectral type	G5[3]
Astrometry
Radial velocity (Rv)	49.84±0.21[1] km/s
Proper motion (μ)	RA: -43.846 mas/yr[1] Dec.: -65.637 mas/yr[1]
Parallax (π)	7.6211±0.0164 mas[1]
Distance	428.0 ± 0.9 ly (131.2 ± 0.3 pc)
Details[3]
Mass	1.01±0.07 M☉
Radius	0.93±0.12 R☉
Luminosity	1.19±0.03[4] L☉
Surface gravity (log g)	4.5±0.1 cgs
Temperature	5,700±100 K
Metallicity [Fe/H]	−0.02±0.10 dex
Rotation	34±15 d
Rotational velocity (v sin i)	1.4±0.6 km/s
Age	6.8±1.3[4] Gyr
Other designations
Amansinaya, CD−23 9677, CPD−23 5039, SAO 179442, TOI-744, TIC 437242640, WASP-34, TYC 6636-540-1, GSC 06636-00540, 2MASS J11013589-2351382, DENIS J110135.9-235138[5]
Database references
SIMBAD	data
Exoplanet Archive	data

Naming

In 2019 the IAU announced as part of NameExoWorlds that WASP-34 and its planet WASP-34b would be given official names chosen by school children from the Philippines.^[7][8] The star is named Amansinaya, after Aman Sinaya, which is one of the two trinity deities of the Philippine's Tagalog mythology, and is the primordial deity of the ocean and protector of fisherman. The planet WASP-34b is named Haik. Haik is the successor of the primordial Aman Sinaya as the god of the sea of the Philippines' Tagalog mythology.^[6]

Planetary system

WASP-34 has a transiting planet discovered in 2011 by the Wide Angle Search for Planets. This is a hot Jupiter, with just over half the mass of Jupiter and taking just 4.3 days to complete an orbit.^[3] The planetary color was found to be redder than other hot Jupiters, hinting at peculiar chemistry.^[9] The planet has a large measured temperature difference between the dayside (1185±47 K) and nightside (726±119 K).^[10]

There is a long-period radial velocity trend, showing evidence for a massive object orbiting further out.^[3] A 2014 study suggests an object at least 15 times the mass of Jupiter at a distance of 5 AU.^[11]

The WASP-34 planetary system^[12][11]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b / Haik	0.583+0.030 −0.031 MJ	0.0521±0.0012	4.3176782(45)	<0.025	85.2±0.2°	1.22+0.11 −0.08 RJ
c (unconfirmed)	≥14.96+6.29 −3.39 MJ	5.05+0.65 −0.46	4093+750 −520	~0	—	—