Key parameters at a glance

A radius of 3.18 Earth radii
A mass of 12.30 Earth masses
Surface gravity around 1.21 g
An orbital period of 7.073 days
Semi-major axis 0.0730 AU
Equilibrium temperature 1,100 K (827 °C)
Distance from Earth 290.11 light-years
Earth Similarity Index 0.210
Travel time at Voyager 1 speed 5,116,088 years

1 sibling around TOI-1736

TOI-1736 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-1736 b this	Sub-Neptune	3.18	12.30	7.073	1,100	2023
TOI-1736 c	Gas Giant	12.50	2,800.00	571.250	249	2023

TOI-1736 b Planet Profile

Physical Specs

Radius

3.18 R⊕

Radius (Jupiter)

0.284 R♃

Mass

12.30 M⊕

Mass (Jupiter)

0.039 M♃

Density

2.09 g/cm³

Surface Gravity

1.21 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.210

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#366of 1978

top 18.5%

This planet

3.18R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1774 b 3.18 R⊕ TOI-2458 c 3.18 R⊕ NGTS-4 b 3.18 R⊕

Metric	Earth	TOI-1736 b	Jupiter
Radius (R⊕)	1.00	3.18	11.21
Mass (M⊕)	1.00	12.30	317.83
Density (g/cm³)	5.51	2.09	1.33
Surface Gravity (g)	1.00	1.21	2.53
Insolation (S⊕)	1.00	329.60	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	12.300 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	11.900 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 408618999

Gaia DR2

Gaia DR2 541725187117160960

Gaia DR3

Gaia DR3 541725187117160960

System

TOI-1736

Percentile among Sub-Neptune cohort

Radius 3.182 R⊕ · percentile 81 / cohort 1978

Mass 12.300 M⊕ · percentile 85 / cohort 1978

Orbital period 7.07 d · percentile 22 / cohort 1946

Distance 88.95 pc · percentile 19 / cohort 1975

ESI 0.210 · percentile 8 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.073 days

Semi-major axis

0.0730 AU

Eccentricity

0.000

Inclination

87.30 °

Year Length

A year here lasts approximately 7.07 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0730 AU.

Transit Fingerprint

Depth

0.044 %

Duration

3.983 h

Impact parameter b

0.426

Rp / R★

0.020419

Transit midpoint (BJD)

2,458,792.7950

Photometric dip

Transit produces a flux drop of 439 ppm lasting ≈ 3.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020419

Semi-major axis / stellar radius

11.400

Impact parameter (b)

0.426

RV semi-amplitude (K)

4.010 m/s

Transit mid-time (BJD)

2,458,792.7950

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.82100

Eq. Temperature

1,100K

(827 °C)

Insolation (S⊕)

329.60

Earth = 1.00

Earth Similarity (ESI)

0.210

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Akana Murphy et al. 2023

Instrument

TESS CCD Array

Publication

2023-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-700 e · Rocky Terrestrial TOI-2095 c · Super-Earth TOI-715 b · Super-Earth TOI-2095 b · Super-Earth TOI-2096 c · Super-Earth TOI-1680 b · Super-Earth TOI-2096 b · Rocky Terrestrial TOI-904 c · Sub-Neptune TOI-1470 c · Sub-Neptune TOI-198 b · Super-Earth TOI-244 b · Super-Earth TOI-4184 b · Sub-Neptune

Host System: TOI-1736

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,636 K — cooler than the Sun (5,778 K)

Estimated Age

9.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.429 R☉

Stellar Mass

1.037 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.142 dex

Stellar density

0.497 g/cm³

Rotational v·sin i

4.00 km/s

Rotation period

28.00 days

Activity index (log R'HK)

-5.020

Metallicity ratio

[Fe/H]

Distance

88.95 parsec

Light-years 290.11 ly

V-band magnitude

8.95 mag

Voyager-speed travel 5,116,088 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.214 mas

Total Proper Motion

48.485 mas/yr

PM Right Ascension

-46.29 mas/yr

PM Declination

-14.41 mas/yr

Galactic Cartesian (pc)

x = 0.259 · y = 0.245 · z = 0.934

Equatorial (J2000)

RA 43.43446° · Dec 69.10135°

Galactic ℓ, b

133.512° · 8.781°

Ecliptic λ, β

66.527° · 49.426°

HTM-20 index

1395191228