TOI-270 | NASA Exoplanet Archive

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
TOI-270
TOI-270 b	3.36 d	1.28 R_⨁	Transit	2019	Günther et al. 2019	Confirmed Planet
TOI-270 c	5.66 d	2.33 R_⨁	Transit	2019	Günther et al. 2019	Confirmed Planet
TOI-270 d	11.38 d	2 R_⨁	Transit	2019	Günther et al. 2019	Confirmed Planet

Exoplanet Archive Notes (3)

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TOI-270 b

Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Günther et al. 2019)

TOI-270 c

Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Günther et al. 2019)

TOI-270 d

Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Günther et al. 2019)

TOI-270 Stellar Parameters (11 Solutions)

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RA: 04h33m39.86s

Dec: -51d57m26.62s

Distance: 22.47930±0.01355 pc

Parallax: 44.4565000±0.0265906 mas

Ecliptic Latitude: -71.89822 deg

Ecliptic Longitude: 43.14225 deg

Galactic Latitude: -42.01396 deg

Galactic Longitude: 259.77379 deg

Total Proper Motion: 282.2188579±0.0506032 mas/yr

Proper Motion (RA): 82.9441000±0.0496865 mas/yr

Proper Motion (Dec): -269.755000±0.050689 mas/yr

Photometry: m_V
12.603±0.039; m_TESS
10.4981000±0.0073581; m_J
9.099±0.032; m_H
8.531±0.073; m_Ks
8.251±0.029; m_W1
8.130±0.022; m_W2
7.983±0.019; m_W3
7.887±0.016; m_W4
7.691±0.089; m_Gaia
11.630600±0.000476; m_B
14.194±0.043; m_g
---; m_i
---; m_r
---

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; Stellar Hosts

Source	Weisserman et al. 2026	Coulombe et al. 2025	Mikal-Evans et al. 2023	Kaye et al. 2022	Van Eylen et al. 2021	TICv8	Günther et al. 2019	Gaia DR2	ExoFOP	ExoFOP	ExoFOP
R_✶ (R_⦿)	0.374±0.011	0.380±0.008	0.380	0.380±0.008	0.378±0.011	0.3743580±0.0114957	0.38±0.02	---	0.37435799837112427±0.01149570000000000	0.37435799837112427±0.01149570000000000	0.37435799837112427±0.01149570000000000
Sp. T	M3 V	---	M3 V	---	M	---	M3.0 V	---	---	---	---
T_eff (K)	---	3506±70	---	3506±70	3506±70	3532.0±157.0	3386+137-131	3886.155+173.572-97.435	3551±74	3551±74	3551±74
ρ_✶ (g/cm³)	---	11.30+0.29-0.32	---	10.63±0.74	7.20±0.63	9.73511850±0.34589380	10.5+1.4-2.2	---	---	---	---
M_✶ (M_⦿)	0.362±0.008	---	---	0.386±0.008	0.386±0.008	0.362274±0.020491	0.40±0.02	---	---	---	---
log g (log₁₀(cm/s²))	4.85±0.03	---	---	4.872±0.026	4.872±0.026	4.8505300±0.0020899	---	---	4.839820±0.382963	4.839820±0.382963	4.839820±0.382963
Metallicity (dex)	-0.14±0.12 [Fe/H]	---	---	---	-0.20±0.12 [Fe/H]	---	-0.17±0.10 [Fe/H]	---	---	---	---
L_✶ (log₁₀(L_⦿))	---	---	---	---	-1.71+0.04-0.04	-1.70665+0.09358-0.11945	-1.8+0.0-0.1	---	---	---	---

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TOI-270 b Planetary Parameters (7 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit; NExoList: JWST; Atmospheric Spectroscopy

Source	Kaye et al. 2022	Weisserman et al. 2026	Coulombe et al. 2025	Kokori et al. 2023	Van Eylen et al. 2021	Günther et al. 2019	ExoFOP
a/R_✶	17.108+3.526-1.858	---	19.09+0.33-0.69	17.48+1.49-3.24	---	17.48+1.49-3.24	---
i (deg)	---	---	89.41+0.40-0.43	88.65+0.85-1.40	89.39±0.37	88.65+0.85-1.40	---
P (days)	3.35992±0.00005	3.36	---	3.360156±0.000012	3.3601538±0.0000048	3.360080+0.000065-0.000070	3.3601670547055087±0.0000035225465909
R_p/R_✶	0.0307+0.0012-0.0009	---	0.03144±0.00010	0.0300±0.0015	0.02920±0.00069	0.0300+0.0015-0.0011	---
T_C (days)	2458461.01464+0.00084-0.00093 (BJD)	---	2460222.240084±0.000035 (BJD)	2458891.1154±0.0013 (BJD-TDB)	2458387.09505±0.00074 (BJD-TDB)	2458461.01464+0.00084-0.00093 (BJD-TDB)	2460987.858405000±0.002242517 (BJD)
T_eq (K)	600±16	585±15	569+14-13	---	581±14	528+56-32	943.9340039989486
M_p (M_⨁)	1.48±0.18	1.49±0.25	1.48±0.18	---	1.58±0.26	---	---
M_p (M_Jup)	0.00466±0.00057	0.00469±0.00079	0.00466±0.00057	---	0.00497±0.00082	---	---
R_p (R_⨁)	1.28+0.05-0.04	1.28±0.04	1.306±0.028	---	1.206±0.039	1.247+0.089-0.083	1.223466617017458±0.072212452135481
R_p (R_Jup)	0.114+0.004-0.004	0.114±0.004	0.1165±0.0025	---	0.1076±0.0035	0.1112+0.0079-0.0074	0.1091505686165967±0.0064423745627005
b	0.48±0.46	---	0.20±0.13	---	0.19±0.12	0.41±0.26	---
e	0.0167+0.0084-0.0089	---	---	---	0.034±0.025	0	---
a (au)	---	---	0.03362+0.00099-0.00128	---	0.03197±0.00022	0.0306+0.0033-0.0057	---
δ (%)	---	---	---	---	---	0.0901+0.0092-0.0066	0.0976694050059835±0.0052568770725906
T₁₄ (hours)	1.294±0.026	---	---	---	---	1.387+0.040-0.034	1.3266673034451342±0.4358402686771111
S (S_⨁)	---	---	---	---	---	---	131.79349226098907
ρ (g/cm³)	3.89±0.66	---	3.7±0.5	---	4.97±0.94	---	---
ω (deg)	---	---	---	---	0.00±103.00	---	---
K (m/s)	---	---	---	---	1.27±0.21	---	---

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TOI-270 c Planetary Parameters (5 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit, Transit Timing Variations

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit; NExoList: JWST; Atmospheric Spectroscopy

Source	Kaye et al. 2022	Kokori et al. 2023	Van Eylen et al. 2021	Günther et al. 2019	ExoFOP
a/R_✶	25.569±0.306	27.01+0.60-1.58	---	27.01+0.60-1.58	---
i (deg)	---	89.53+0.30-0.42	89.36±0.24	89.53+0.30-0.42	---
P (days)	5.66051±0.00004	5.6605746±0.0000046	5.6605731±0.0000031	5.660172±0.000035	5.6604773250877169±0.0000017056359401
R_p/R_✶	0.0560±0.0017	0.05825±0.00079	0.05701±0.00071	0.05825+0.00079-0.00058	---
T_C (days)	2458463.08056±0.00040 (BJD)	2458734.79487±0.00029 (BJD-TDB)	2458389.50285±0.00029 (BJD-TDB)	2458463.08481±0.00025 (BJD-TDB)	2460982.004741000±0.000611374 (BJD)
T_eq (K)	489±11	---	488±12	424+20-19	729.6927145070847
S (S_⨁)	---	---	---	---	47.063853285426774
R_p (R_⨁)	2.33±0.01	---	2.355±0.064	2.42±0.13	2.3625955296403496±0.0826129403545672
R_p (R_Jup)	0.208±0.001	---	0.2101±0.0057	0.216±0.012	0.21077701825647266±0.00737024557055105
δ (%)	---	---	---	0.3394+0.0094-0.0068	0.345184404189862±0.007284104907693
T₁₄ (hours)	1.682±0.019	---	---	1.658+0.015-0.012	1.6617716161171816±0.2415571182018964
b	0.35±0.06	---	0.28±0.11	0.22+0.17-0.14	---
e	0.0044+0.0005-0.0006	---	0.027±0.021	0	---
a (au)	---	---	0.04526±0.00031	0.0472+0.0030-0.0033	---
M_p (M_⨁)	6.20±0.31	---	6.15±0.37	---	---
M_p (M_Jup)	0.0195±0.0010	---	0.0194±0.0012	---	---
ρ (g/cm³)	2.70±0.14	---	2.60±0.26	---	---
ω (deg)	---	---	10±90	---	---
K (m/s)	---	---	4.16±0.24	---	---

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TOI-270 d Planetary Parameters (6 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit, Transit Timing Variations

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit; NExoList: JWST; Atmospheric Spectroscopy

Source	Kaye et al. 2022	Kokori et al. 2023	Mikal-Evans et al. 2023	Van Eylen et al. 2021	Günther et al. 2019	ExoFOP
a/R_✶	41.744±0.527	41.56+0.70-0.83	41.80+0.61-0.59	---	41.56+0.70-0.83	---
i (deg)	---	89.69+0.16-0.12	89.68±0.12	89.73±0.16	89.69+0.16-0.12	---
P (days)	11.38194±0.00011	11.379568±0.000012	11.38014	11.379573±0.000013	11.38014+0.00011-0.00010	11.379699121657531±0.000007297717774
R_p/R_✶	0.0491±0.0016	0.05143±0.00074	0.05278+0.00095-0.00118	0.05163±0.00069	0.05143±0.00074	---
T_C (days)	2458469.33823±0.00032 (BJD)	2458776.58464±0.00037 (BJD-TDB)	2459129.34868+0.00691-0.00544 (JD-UTC)	2458389.68186±0.00059 (BJD-TDB)	2458469.33834+0.00052-0.00046 (BJD-TDB)	2460984.2470910000±0.0014269243 (BJD)
b	0.23±0.08	---	0.233+0.089-0.085	0.19±0.11	0.224+0.083-0.110	---
e	0.0066±0.0020	---	0	0.032±0.023	0	---
R_p (R_⨁)	2.00±0.05	---	2.19±0.07	2.133±0.058	2.13±0.12	2.0234009062750817±0.0786569633019303
R_p (R_Jup)	0.178±0.004	---	0.195±0.006	0.1903±0.0052	0.190±0.011	0.18051604873180679±0.00701731632939026
δ (%)	---	---	0.2786+0.0101-0.0124	---	0.2645±0.0078	0.296095494818468±0.007892959569814
T_eq (K)	383±9	---	---	387±10	340±14	485.37101855673984
S (S_⨁)	---	---	---	---	---	9.213461075387041
T₁₄ (hours)	2.117±0.018	---	---	---	2.148±0.018	2.0489434475769053±0.1264447969347552
a (au)	---	---	---	0.07210±0.00050	0.0733±0.0042	---
M_p (M_⨁)	4.20±0.16	---	---	4.78±0.43	---	---
M_p (M_Jup)	0.0132±0.0005	---	---	0.0150±0.0014	---	---
ρ (g/cm³)	2.90±0.24	---	---	2.72±0.33	---	---
ω (deg)	---	---	---	-6.0±90.0	---	---
K (m/s)	---	---	---	2.56±0.23	---	---

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 3 Confirmed Planets; 1 2MASS Point Source Catalog

Data Files: 4 KELT Time Series; 3 Associated Literature Data

Bibliography (15 References)

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Super-Earth masses and stellar abundances from NIRPS reveal tentative evidence for water-rich formation around M dwarfs
Weisserman et al. 2026 Reference Overview
Possible Evidence for the Presence of Volatiles on the Warm Super-Earth TOI-270 b
Coulombe et al. 2025 Reference Overview
Competing chemical signatures in the atmosphere of TOI-270 d: Inference of sulfur and carbon chemistry
Felix et al. 2025 Reference Overview
Possible Hycean conditions in the sub-Neptune TOI-270 d
Holmberg & Madhusudhan 2024 Reference Overview
Exploring the Ability of Hubble Space Telescope WFC3 G141 to Uncover Trends in Populations of Exoplanet Atmospheres through a Homogeneous Transmission Survey of 70 Gaseous Planets
Edwards et al. 2023 Reference Overview
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
Kokori et al. 2023 Reference Overview
Hubble Space Telescope Transmission Spectroscopy for the Temperate Sub-Neptune TOI-270 d: A Possible Hydrogen-rich Atmosphere Containing Water Vapor
Mikal-Evans et al. 2023 Reference Overview
Transit timings variations in the three-planet system: TOI-270
Kaye et al. 2022 Reference Overview
Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley
Van Eylen et al. 2021 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
A super-Earth and two sub-Neptunes transiting the nearby and quiet M dwarf TOI-270
Günther et al. 2019 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
ExoFOP TOI Table
ExoFOP
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview

Legend

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

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TOI-270 Overview

TOI-270 Architecture & Discovery Information