J/AN/347/70071 Circumstellar atomic radiation-driven dynamics (Lehtmets+, 2026)
Investigating Circumstellar Atomic Radiation-driven Dynamics.
Lehtmets A., Kama M., Fossati L., Aret A.
<Astron. Nachr. 347, e70071 (2026)>
=2026AN....34770071L (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Atomic physics ; Accretion
Keywords: acceleration of particles - stars: circumstellar matter -
stars: planetary systems - scattering
Abstract:
The interactions between stars and their orbiting planets, driven by
forces such as stellar radiation and gravity, play an essential role
in shaping exoplanetary atmospheres and gas-rich debris discs. One way
to look into the composition of these environments is to observe how
they can contaminate the stellar photospheres. For that, we examine
how stellar radiation pressure and gravity influence atomic species
and analyse their effects across various stellar effective
temperatures. Using the radiative -to-gravitational force ratio, we
determined the atomic movement direction and assessed the velocity
boost imparted to neutral atoms escaping from exoplanet atmospheres or
debris discs. Incorporating the solar far ultraviolet/extreme
ultraviolet spectrum to address flux discrepancies in the ATLAS9
model, we find that radiation affects atoms differently according to
their ionisation state, with highly ionised species less affected by
stellar radiation. Our results conclude that the stars most suitable
for observing stellar contamination are those between 6,500 and 8,000
K, with neutral noble gases and ionised iron-peak elements as the most
likely contaminants.
Description:
Here is all the data from the tables in the article. Used stellar
parameters (temperature, mass, age, logg), calculated beta ratio data
for each ion (given in a range of stellar effective temperatures) and
velocity boosts (given in a range of stellar effective temperatures).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 23 9 Chosen parameters for calculation of beta ratios
and velocity boosts
tablea2.dat 253 76 Beta ratios of all investigated atoms and ions
across 9 different stellar effective temperatures
tablea3.dat 85 28 Ionisation rates of neutral atoms
tablea4.dat 121 28 Velocity boosts of neutral atoms
tablea5.dat 118 81 Beta ratio values from this work with photospheric
emission and modified stellar EUV compared to
Fernandez et al., 2006ApJ...643...509K results
at 8000K stellar effective temperature
tablea6.dat 41 19 Velocity boost values from this work with
photospheric emission and modified stellar EUV
compared to Fernandez et al., 2006ApJ...643...509K
results at 8000K stellar effective temperature
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 Myr Age [20] Stellar age
4- 7 F4.2 Msun Mass [0.75/6.20] Stellar mass
9- 13 F5.3 Rsun Radius [0.576/2.370] Stellar radius
15- 19 I5 K Teff [4000/19000] Stellar effective temperature
21- 23 F3.1 [cm/s2] logg [4.5] Stellar surface gravity in
logarithmic scale
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ion Ion name (e.g. H_I, He_II)
8- 16 E9.2 --- B1 Beta ratio value at 4000 K
18- 26 E9.2 --- ea_B1 Beta ratio absolute error at 4000 K
28- 35 E8.2 % er_B1 Beta ratio relative error (%) at 4000 K
37- 45 E9.2 --- B2 Beta ratio value at 4500 K
47- 55 E9.2 --- ea_B2 Beta ratio absolute error at 4500 K
57- 64 E8.2 % er_B2 Beta ratio relative error (%) at 4500 K
66- 73 E8.2 --- B3 Beta ratio value at 5000 K
75- 82 E8.2 --- ea_B3 Beta ratio absolute error at 5000 K
84- 91 E8.2 % er_B3 Beta ratio relative error at 5000 K
93-100 E8.2 --- B4 Beta ratio value at 6000 K
102-109 E8.2 --- ea_B4 Beta ratio absolute error at 6000 K
111-118 E8.2 % er_B4 Beta ratio relative error (%) at 6000 K
120-127 E8.2 --- B5 Beta ratio value at 8000 K
129-136 E8.2 --- ea_B5 Beta ratio absolute error at 8000 K
138-145 E8.2 % er_B5 Beta ratio relative error (%) at 8000 K
147-154 E8.2 --- B6 Beta ratio value at 10000 K
156-163 E8.2 --- ea_B6 Beta ratio absolute error at 10000 K
165-172 E8.2 % er_B6 Beta ratio relative error (%) at 10000 K
174-181 E8.2 --- B7 Beta ratio value at 13000 K
183-190 E8.2 --- ea_B7 Beta ratio absolute error at 13000 K
192-199 E8.2 % er_B7 Beta ratio relative error (%) at 13000 K
201-208 E8.2 --- B8 Beta ratio value at 17000 K
210-217 E8.2 --- ea_B8 Beta ratio absolute error at 17000 K
219-226 E8.2 % er_B8 Beta ratio relative error (%) at 17000 K
228-235 E8.2 --- B9 Beta ratio value at 19000 K
237-244 E8.2 --- ea_B9 Beta ratio absolute error at 19000 K
246-253 E8.2 % er_B9 Beta ratio relative error (%) at 19000 K
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ion Ion name (e.g. H_I, He_I)
6- 13 E8.2 10+10s-1 I1 Ionisation rate value at 4000 K
15- 22 E8.2 10+10s-1 I2 Ionisation rate value at 4500 K
24- 31 E8.2 10+10s-1 I3 Ionisation rate value at 5000 K
33- 40 E8.2 10+10s-1 I4 Ionisation rate value at 6000 K
42- 49 E8.2 10+10s-1 I5 Ionisation rate value at 8000 K
51- 58 E8.2 10+10s-1 I6 Ionisation rate value at 10000 K
60- 67 E8.2 10+10s-1 I7 Ionisation rate value at 13000 K
69- 76 E8.2 10+10s-1 I8 Ionisation rate value at 17000 K
78- 85 E8.2 10+10s-1 I9 Ionisation rate value at 19000 K
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ion Ion name (e.g. H_I, He_I)
6- 15 F10.6 km/s Vb1 ?=- Velocity boosts value at 4000 K (1)
17- 27 F11.7 km/s Vb2 ?=- Velocity boosts value at 4500 K (1)
28- 39 F12.7 km/s Vb3 ?=- Velocity boosts value at 5000 K (1)
41- 55 F15.10 km/s Vb4 ?=- Velocity boosts value at 6000 K (1)
56- 69 F14.9 km/s Vb5 ?=- Velocity boosts value at 8000 K (1)
71- 83 F13.8 km/s Vb6 ?=- Velocity boosts value at 10000 K (1)
85- 97 F13.8 km/s Vb7 ?=- Velocity boosts value at 13000 K (1)
99-110 F12.7 km/s Vb8 ?=- Velocity boosts value at 17000 K (1)
111-121 F11.6 km/s Vb9 ?=- Velocity boosts value at 19000 K (1)
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Note (1): "---" means that the beta ratio for that species and at that
stellar effective temperature is under 0.5.
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ion Ion name (e.g. H_I, He_II)
8- 27 E20.16 --- BPE ?=- Beta ratio value from this work with
photospheric emission (1)
29- 48 E20.15 --- e_BPE ?=- Beta ratio value from this work with
photospheric emission error (1)
50- 69 E20.15 --- BMS ?=- Beta ratio value from this work with
modified Stellar EUV (1)
71- 90 E20.15 --- e_BMS ?=- Beta ratio value from this work with
modified Stellar EUV error (1)
92-106 F15.10 --- BF06 ?=- Beta ratio value from Fernandez et al.,
2006ApJ...643...509K (1)
108-118 E11.7 --- e_BF06 ?=- Beta ratio value from Fernandez et al.,
2006ApJ...643...509K error (1)
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Note (1): '0' means that the value is lower than 10-30,
'---' means that there is no available linelist data.
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Byte-by-byte Description of file: tablea6.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ion Ion name (e.g. H_I, He_I)
6- 19 F14.9 km/s VbPE Velocity boost value from this work with
photospheric emission
21- 33 F13.8 km/s VbMS Velocity boost value from this work with
modified stellar EUV
35- 41 F7.4 km/s VbF06 Velocity boost value from
Fernandez et al., 2006ApJ...643...509K
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Acknowledgements:
Alexandra Lehtmets, alexandra.lehtmets(at)ut.ee
(End) Alexandra Lehtmets [UT TO, Estonia], Patricia Vannier [CDS] 20-Aug-2025